Hello Spotter70
...................Also i was in conversation yesterday who had said that if the Radarbox is connected to an outside aerial it could render it useless................
Won't anticipate AirNavs answer on this, (if there is one at all) but my advice would be: NEVER listen to that one anymore you have been "in conversation with".
(At least not, if it is about antennas)
May be, AirNav has an answer on this. that is more diplomatic than mine.
Regards
Karl