FlightAware’s very popular and inexpensive bandpass filter with SMA connectors is on sale! Save USD 3.00 per filter (Canada is also discounted). This is a great opportunity to pick-up a filter if you haven’t tried one with your PiAware.
$11.95 (USA) Amazon.com
$17.50 (Canadian) https://www.amazon.ca/ADS-B-1090MHz-Band-pass-SMA-Filter/dp/B010GBQXK8
Learn more about filters here: Track more aircraft by using a filter