Homebrew 20m / 40m Vertical Antenna




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freakybwoy1: @RIDpickleorigional Yes they are fibre glass and are not carbon fibre. I specifically chose which poles to buy. The 10m pole was purchased from ebay (in the UK) at a cost of £15 plus postage. The wire and other bits come to around a fiver.

freakybwoy1: But with this way, there is no need for an ATU for 20 or 40m :-) With a little playing with wire lengths, I managed to get the SWR below 1.5 on both bands. One other thing, as this is a ground mounted antenna, it is VERY important you have a GOOD earth system. (Basically its the other half of the antenna). You can do this by using an Earth Rod (more than one maybe) and lots of wire radials. The radials dont need to be any particular length as they are ground mounted.

freakybwoy1: @RIDpickleorigional Absolutely..! The great thing about Ham Radio is playing around with antennas. As long as you have a rough idea of how long it should be then you can simply play around. The "Ugly Balun" that you mention is something I thought of adding, but as the RF in the shack was minimal, and no TVI caused I havnt bothered yet. Its just to stop the common mode current, but I may add soon.

freakybwoy1: @RIDpickleorigional I believe it is to do with impedance where the antenna connects to the coax. The lengths of antenna wire are typically measured so the impedance matches the coax (50 Ohm) or as close as we can get it. With a half wave, a matching device would be needed to better match the impedance to 50 ohm. I suppose you could make a matching device (simple atu) that you just switch in an out of circuit when you want to use the other band.

RIDDICKorigional: Question? are your poles fibreglass - how do you know they do not contain carbon black as told this is very lossy for antennas i want buy pole but need make sure no carbon in it tnx.

RIDDICKorigional: @freakybwoy1 Hi yes i was meaning with ATU but see you are using them to correct length without having use tuner no probs good show probably best way where did you purchase the poles for antennas pls just wondered tnx Dave.

RIDDICKorigional: @freakybwoy1 best to coil it around pvc pipe one end to other also as if you simply coil the coax up and tape it together there is chance that the first and last coils will touch which will cancel it out :~) and not be effective like supposed to.

Darren Sparky: hi ya great video...whats inside the box at the bottom of the antennas....I have limited space so this idea would work great for me regards Daz

RIDDICKorigional: Hi will the 40m antenna not work as both quarter wave on 40m and half wave on 20m to eliminate use of two antennas just trying get my head around it thanks.

RIDDICKorigional: @freakybwoy1 just to mention you will benefit from an all band hf air core 1:1 choke balun or as they call it the UGLY BALUN at feedpoint to antenna - cut out any feeder radiation eliminating any inteference and ensuring antenna is doing all the radiating more power up the spout etc simply make coil between 18 to 21 feet of coax around pvc form pipe at antenna feedpoint or as close as - number of turns not important but length is 18 to 21 feet :>) this will maintain balance.

RIDDICKorigional: You could also measure them as half wave antennas and just spiral wind the wire on to poles instead of running straight up just a thought :>)

freakybwoy1: @sparky7083 Hi Daz, Sorry for the late reply, didnt realise I had a comment. There is nothing in the box apart from linking wire. Just wire links from the SO239 connector to the terminal blocks. It was a un-un, but I ripped out the transformer as it made the antenna worse. How it is now is spot on. 73's PS, cheap to make.. Like £20 all parts!

Reggy Love: add more radials (read online about 120) will do the job on the ground. OR you can try one or two 1/4 wave for each band raised above ground. i tried raising the radials 10cm above ground in a simulation went from -5 or -6 to -1db maximum gain. from what i found online is that two 1/4 wl radials at 0.2wl above ground are about equal to 120 various radials on the ground. 73's de OY1R.
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Homebrew 20m / 40m Vertical Antenna 4.3 out of 5

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Homebrew 20m / 40m Vertical Antenna