40 Meter Inverted V Antenna - Build, Tune & Test!




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Dave Mitchell: I've been building antennas over 56 years and I've found a better way to adjust the length of the inverted vee legs WITHOUT AN SWR ANALYZER! We know that a quarter-wave antenna length in feet is 234 divided by the frequency in MegaHertz. But take your first SWR readings across the band (in this case 40 meters) and find where the SWR "dip" is. Then decide where you actually want it to dip (say the middle of the band) multiply that frequency times the length and that becomes your new "constant" instead of 234. Use that new constant to figure the difference between original length and the length you want for the new "dip" (such as the center of the band). The difference will be in feet (such as .25 feet). Convert to inches (such as .25 feet = 3 inches) and shorten (or lengthen) each leg of the inverted vee that much, and VOILA!! 

Michael Lloyd: If you put RTV on your connection just before you slide the heat shrink down when the tubing shrinks it "squishes" the RTV out and around the connector and forms a nice water tight seal. I do this on boat wiring and it works great.

Bill Clark: Great video ..what a beautiful spot you have in KS..I am an FM enthusiast but know nothing about ham radio. I know a bit more thx Windham vt

Rob Knight: What kind of tower do you have and how tall is it?

COPE Farms: Best how to video ever for dipole antennas. Thank you so much for sharing. Im sure it has helped many people like myself.

Whitey: Thanks for posting a video which is easy to understand from start to finish. My GAP Titan DX vertical is down for repairs, so I am new to homemade wire antennas, and this is the best video I have seen so far. I will be subscribing and going through your old videos. Right now I have a 40 meter Double Bazooka on the way, but I can see with the right equipment a homebrew antenna has an advantage with lower costs, and putting up an antenna to fit one's location needs. WV8FKG

Sidney Boudro: How much does that tight wound 5 turn choke on each half the dipole shorten the antenna? I am trying to remember something else. Do you attach the brad out some distance from the center to make a better impedance match?

Sidney Boudro: Good antenna school thanks. There was something about feeding the HF antenna somewhat off center and I don't remember which is longer the center conductor or the braid.

Andrew McKay: New to amateur radio. What does it mean when you're saying you're One Delta Kansas? Managed to follow most of the contacts but I'm not familiar with exactly what that means.

Morse Code: Very useful, thanks!

Bob Goyetche: Enjoyed this one a lot, very informative - thanks for doing this.. 73 de VE2PDT 

berkmanyt: Dave just re-watched several antenna video…nice job .

skutman1: I'd just made ​​an antenna from a friend bought :)

Grant Fullen: Thanks for this video. Great JOB . Very informative. 

Jeff Jefferson: He Dave, first of all i like to say that i really like your videos. But watching this video, left me with some questions. I want to build an inverted v antenna, now ive looked into them for a bit. What i saw was that there are ferrite beads that can be put on the coax where the antenna ends and the coax starts. Will ferrite beads be good to add to this antenna? Or will it not be to much to bother about? I've red that it improves the signal by filtering out all the higher frequenties. My next question is: Can i use stranded wire for an antenna? Are there any pros or cons? Im looking to use stranded wire, because it needs to be packed into a backpack. And i dont want to bother with solidwire so much, because of bending/breaking, and having to straiten it out. Hope you can help me out. Best regards, Jeff

mowtown75: Hi Dave, very metodical, great vid. Is that a Balun or just a connector please? what would it be called? suspecting its not a balun as you are adjusting the angle of radiators for ohms match? ta Tim VK8FLLA

divchief07ut: Nice video! Hope to build one when I get a HF rig.

chalemi: What an awesome video! Nice job. I have a question about wavelength. The wavelength pertains to the antenna length...does it also apply to the height? in other words a 1/4 wave cut for 40 meters is appx 32.8 ft-should the antenna also be at 32 ft?

steve c: Dave, when you put the end of the orange wire through the eye bolt then wind it around 5 turns doesn't that create a coil that changes the tuning of the antenna? Wouldn't it be better to connect the black wire from the connector to the straight part of the orange wire outside of the eye bolt to avoid the 5 turn coil at the end? Or maybe just loop the orange wire through the eye bolt and solder or clamp it together without winding any turns at all?

Kelley Shiveley: Another great video, Dave

Frederik Veeneman: this is already a old movie but i really like it I just bought my first HF trx and expect it to arrive this weekend , but i never made an HF antenna before , so was doing some research on how to actually do that Thanks for sharing your experience 73' De PA4V

Joe Esposito: Hi Dave like your video you have any suggestions on a short 40meter dipole for limited space?

Dmitriy H.: Hi, Dave! Tnx for your videos! You are good teacher. 73's to Kansas from Siberia! tu de RV9MD ee

rlrsk8r1: Great (pair of) videos. I'm looking to make a more modular antenna structure where the center feed point can be used with multiple "sets" of elements, either swapping them out, or doing a non-parallel fan or an umbrella inverted V. This is a pretty good place to start.

Hein Krohne: great video dave, thanks.

roman7296: Excellent, this help me a lot. Thanks KS4BJ

Vasile Pop: Congratulations! Wonderful video. 73 de VA6POP

TimTools99: Hey Dave, I made one of your connectors today and just finished the antenna. I have to order some coax and get this thing up on the tower! Having a ball. Thanks again for your help. 73s

VerifyHistory: thanks for the detailed video!

edward gomez: Where can i get the solid wire you are using, my e mail is wp4okg@yahoo.com, thanx!!!

Johnny Valdes: can I used this antenna on 27.205 Mhz?

fishhead fishmouthe: i understand now. thanks, jeff KK4FXJ

Dave Tadlock: @aka572 Yes, it's the contest exchange. Delta class are home stations on commercial power. Alpha class stations are club portable stations.

Jim Cameron: I have the same rig for HF I love it great radio

iam he: Nice job Dave, very well done.

Jeff Chancey: how close is too close? =)

vetham100: Dave, thank you so much. This will be perfect for field day 2013 :) I always enjoy your videos, they are very informative. 73 VE3QJ

Dave Tadlock: They can still interact with each other if they are too close together. Even though they are running in different directions, they are both still horizontally polarized. Space them as for apart as possible. Thanks for watching and 73! :)

Dave Tadlock: @Jackupnow The wire will most likely be less expensive to purchase in your country rather than to have it imported. Search for 14-1 solid PE. More details on my Facebook page as someone else asked, too. My web site and Facebook links are posted on my YouTube channel. 73! :)

grounded1943: Hi Dave how can just moving the insulator be the same as cutting the wire to a shorterr length? What am I missing?

Alan Spicer: Maybe I can take it down ... check the length of the 2 elements and remove that balun and just make a feed point and fix it. I was able to load that wire up with an MFJ roller inductor tuner and put an AL-811 amp into it ... but it was never truly reasonant anywhere near 80 meters.

Dave Tadlock: Please note: The height of the ends of the antenna above the ground looked different through the camcorder lens and is instead about 10' instead of 15'-20' as mentioned in the video.

Jackupnow: Thanks Dave some hams here asked about the balun now I can give them your reply also where can I get the 14 gauge wire from in the U S A as here in Australia we don't stock it any more only multi strand thanks again

Dave Tadlock: You can use the larger caps and plugs but they will be a bit large. You can also use two caps and a section of PVC pipe. With the 1-1/4" caps you'll want to take an SO-239 connector with you while shopping to make sure that it fits as some caps are made with a thicker wall. Also, some guys mount the SO-239 on the outside of a flat cap if doesn't fit on the inside. Check my website for the feed-point connector parts kit. Thanks for watching and 73! :)

grounded1943: Hi Dave How can moving the insulator on the inverted v antenna be the same as cutting the wire to the proper length for the lowest vswr at the operating freqency?

mwiz100: Really, really useful video dude! I'm still just going on my tech class license but I've been looking into HF and wondering for awhile how one properly sets up and tunes a wire dipole/invert V like this. Thanks for the extended detail of the full setup and tuning process. Helped me get a good handle on the final steps!

Dave Tadlock: If you have the space try making the 40/80/160m antenna. The tri-band antenna is easier to tune than the 40/80m antenna as it should not require any modifications to the coils. Please visit my website for more information about both antennas. If you have questions then please click the link on my website to my Facebook page. Questions, antenna photos, etc. can be posted on my Facebook page. Thanks for watching and good DX! :)

Joe Sheets: Dave, Wow! excellent videos! You have taught me so much in the last few days since I found your channel. I have subscribed. I was wondering if you have done any propagation wave modeling on the 40/80 or 40 inverted V? (ie EZNEC). Do they tend to omni-directional? I live on an acre, but it is wooded so I am trying to find out the best location to put the antenna to give me the most options. Thanks, Joe KJ4LZM

Bob McClard: Great job and thanks for including the FD operation at the end... nice antenna. You show that careful tuning can make a big difference in the antenna SWR.

Andrej Lebedev: Thank you !!! 73!
Rating:
40 Meter Inverted V Antenna - Build, Tune & Test! 4.9 out of 5

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40 Meter Inverted V Antenna - Build, Tune & Test!