Thanks for the replies.
I have looked further into PWSPITFIRE site reception using "playback.pilotaware.com" and my ADS-B Out transmissions were detected on one particular flight.
However, it seems a very insensitive site. I was at 1500 ft and had to be within approx. 5 NM miles of PWSPITFIRE before it picked me up.
I was flying to the south and southwest of the ATZ.
Maybe an antenna or receiver issue?
By comparison, site PWEGHJ was picking me up about 30 NM away on that flight..
