If you received a FlightFeeder kit from FlightAware between mid-November 2014 and early March 2015, your kit may have included a defective antenna that is resulting in very poor coverage (low range, few aircraft, etc). The defective antenna looks like this:
The only practical solution is to replace the antenna with a new, similar one that works correctly. FlightAware will be contacting affected individuals in the next two weeks to coordinate a replacement that you will receive in May 2015.
We apologize for any inconvenience or hassle, but continue to thank you for your awesome, continued support. Thank you.