I live about 2 miles from my local airport. I have used a simple spider antenna with 4 legs, and also purchased the FlightAware antenna. They both work very well with my dump1090/Skyview setup. However, they both have an obvious “null” in that they can’t see the planes at a higher relative angle above my location. For instance, I can see planes head toward the airport and enter the traffic pattern, but I will lose them on downwind/base/final due to my close proximity; I’ll only see them again once they are on the runway and taxiing on the ground.
Is there a good, DIY homebrew antenna that I can make to have omnidirectional coverage around my location? I don’t care about planes over 20-25 miles away, I’d rather have a much better picture of the local airspace and the traffic taxiing at the airport. I’ve heard about things like biconicals, eggbeaters, etc., but I haven’t found anything interesting for 1090 MHz yet. Thoughts for something to whip up on the cheap?