I have a FlightAware Pro Stick Plus connected to the flightaware antenna in my loft. I was using a 5m cable to connect it to my pi. After seeing some comments about having as shorter cable as possible I got an adapter so I could plug the FlightAware Pro Stick Plus directly to the antenna without any cable in the loft. My coverages has gone from 200NM to under 100NM!
Should it have improved my range, is it possible I have a bad connector or is what I have done a bad idea?