If you want the best ADS-B performance easily: buy a FlightAware antenna ( Amazon USA) and an Uputronics 1090 Mhz filtered preamp (distributors for UK and USA).
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Links open in a new tab, some product links are Amazon affiliate links (you pay the same, full disclaimer here). Images open full-screen when you click or tap on them, right-click and save images to evaluate data. Including my errors too, because detailing mishaps might help others trying to run a similar test, something I'd love to see and then share results to the public domain - better approximation of a homemade antenna performance can be only achieved with more data at different locations with different setups.
![planeplotter movile stopped displaying airplanez planeplotter movile stopped displaying airplanez](http://www.planeplottermobile.com/img/table_thumb_140.jpg)
There's no "assume", simulations, infinite ground planes or conjecture here - I've built antennas, placed them on four mounts on a window ledge, and documented results. Sort of a diary, really, I hate excessive technical information whenever unwarranted, but in this case, describing minuscule tidbits are justified as circumstances will influence reception performance. Undoubtedly, a pro antenna ( comparison of five commercial antennas here) is the easiest and a homemade antenna is significantly cheaper than most ready-made solutions, but I haven't came across a systematic and published side-by-side performance comparison under real-life conditions for ADS-B antennas. Why? The antenna is a key element in an ADS-B setup, but cost can be a barrier of entry.
![planeplotter movile stopped displaying airplanez planeplotter movile stopped displaying airplanez](https://history.ua.edu/wp-content/uploads/2018/07/Placement-Pie-Chart-1022x1024.png)
![planeplotter movile stopped displaying airplanez planeplotter movile stopped displaying airplanez](https://i2-prod.dailystar.co.uk/incoming/article24294145.ece/ALTERNATES/s615b/0_plane.jpg)
Comparing several homemade DIY ADS-B antennas against a pro FlightAware antenna.