So over the past few days I have been thinking about how high does my antenna actually need to be. Turns out it doesn’t have to be very high at all. I have done two park activations in two days time and on both days I never raised the antennas any more than 9 feet off the ground. That’s right! 9 feet max! Almost had them running dead horizontal from the picnic table 65 feet away from me. No throwing the hoist line multiple times to get it in a good spot or even having to throw it at all actually, I just tied it off to a limb that I tossed the end of the line over without even adding the throw weight to it!!! Easy peasy!!!
A quick look at the QSO maps for these two outings shows that the radiation pattern is typical for a low altitude wire antenna. Pretty much omni-directional or a “globe” shaped pattern. Also these tests were done on days that had pretty bad solar activity and the bands were in terrible shape. I think this is why there is not near as many western stations as compared to other activations. Also note the signal reports on the logs and that they were not really bad when the bands would open as I was strictly running 5 watts QRP power also.
The low position creates a very obvious take off angle as the contacts on this outing are almost in a perfect circle around me!!!
So all in all, I would say that if you want to be on the air for a while, go to the trouble of getting the antenna as high as possible. On the other hand, if you want to get a quick activation in on your lunch break or if your doing a RADAR run of some such, it seems that getting the wire up off the ground a couple of feet works good enough to get an activation in less than an hour. I am going to repeat this test in the fall with literally laying the radiator on the ground and I will take my VNA and see what it looks like in all three positions. This helped me to understand that it really doesn’t seem to matter if you cant get your antenna up high enough for proper directional effects.
The end insulator is only about a foot above my hand here and is even under a tree!!!
I strung my antenna almost horizontally from the picnic table on two different park activations at two different parks to see if I would get more or less contacts with a really low antenna and the results are in. Seems that if you cant get your antenna really high up (for the lower bands) that is seems not to matter if it is 20’ high or 3 feet about the hard deck. My logs for the two activations look like any other day when I stress over getting the wire up high into a tree. The only real benefit from getting the wire up really high is it prevents others from tripping over it by not noticing it. This was my only real concern while activating both parks, although I did go at times when I knew that there would be fewer people and at Booker T Washington state park I was literally the only person in the area I was in. I just didn’t want problems during my experiment, so I chose times that would protect park users and my gear and preventing the gear from being a trip hazard as well.
If you don’t have coffee, is it even a legit activation???
The signal reports were cyclic as the band would open and close, but all in all, I was getting good reports even though I was running 5 watts through a tuner as well. I like doing these kinds of experiments as it allows me to see just how bad the setup can get and it will still work… lol. All kidding aside, this worked way better than I thought it would and setup was FAST. I really liked that part about it.
Thanks for reading along, I hope you enjoyed it and if you did, please hit the like button and dont hesitate to leave a comment too. I love comments!!!
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David - WK4DS