Total posts : 45366
I want to take this opportunity to thank you for your excellent analysis of the elevated Part 15 antenna. To my knowledge, this is the first time a technically accurate analysis of elevated part 15 antennas has been posted on the web.
Everyone seems to “know” that elevating the antenna improves performance, but the reason has been elusive. The instinctive answer is that elevating the antenna gets it above obstacles. This may be true to some extent, but your results show the radiation from the long ground is more of a factor.
There has been persistent discussions here in the past of the benefits of an elevated ground plane to enhance the performance of an elevated antenna. What do you think of that concept? My gut feeling says the benefit of radiation from a long ground lead is better.
Here’s a thought. I think many elevated antennas consist of a long mast pipe or ground lead right up against the side of a building with the antenna protruding above the roof line. It seems the benefit of the long ground lead radiation may be negated by the close proximity to the building. Negative factors would be conductive siding and close proximity to house wiring.
Your analysis is valid for an elevated antenna well clear of obstacles, but not so much for a “typical” elevated installation.
My take is that the best elevated antenna would be up on a 20+ ft pole or tower that is out in the open and well clear of any obstructions.