(TL;DR: If you’re running PiAware indoors, using a full-wave antenna may give you a really nice bump in signal quality)
I’m running PiAware for almost 8 months (and had a perfect streak until my SON UNPLUGGED THE &^% THING while I was out of town.) I’m in an indoor setting, a window that faces SW with a decent sky view, and I’m in one of the approach routes for IAH.
Was seeing lots of close-by traffic, but anything over 50 miles was pretty much a few blips and it would drop off. After looking at some of the ingenious setups here (I know when I am among my betters when it comes to understanding RF), I wanted more. But I am hesitant to take the step of an outdoor penetration (leakage, sealing, and electrical concerns).
Was using the little antenna that came (I think) with the PiAware stick (about 6 inches, with a coil at the bottom, magnetic base).
I read just enough about antennas to pick up that the ratio of the antenna length to wavelength is important. Look again at 6-inch antenna, which is a little more than a half-wave. Look at the dinky little extendable antenna I got with another SDR dongle, notice they have the same connector…
I extended it to just under 11 inches, taped it in place on the window frame, and went downstairs to see if I had trashed it. Quite the opposite, and here’s the results. I swapped antennas about 10PM CDT on the 26th. Immediately saw a HUGE increase in number of positions/sec.
After 24 hours, I can say that I am not seeing a lot more aircraft than I was before, but I am getting a whole lot more positions from them. Flights that dropped off after 40 NM now give consistent readings for almost twice that, and I’m seeing a lot of traffic to the E and N - which has to come through the roof.
Since I live in an area with extremely dense air traffic, I think there’s probably more value to being able to give solid positions on the many flights close by, and not worry too much about getting more range.
I’m curious, does anyone know at how many positions/sec a PI3 can reliably handle? (Bonus: How much of a hit does that number take if you’ve got a single machine looking at the local PiAware data page?)