Tip. check your SDR for internal noise / spikes / birdies so you don't have a losing battle for range. my NooElec SmarT sux

[galenthurber]

My Nooelec SmarT has birdies / internal noise spikes at 1080, 1087.2, 1094.4Mhz etc (nasty)
So it is poor for tracking 1090Mhz ADSB signals.
If you own one of these SDRs and are feeding check it for these reception killing internal spikes.