Hi Deadcalm,
it's me again, Karl. We "met" some time ago when it was about your "drowned" GP 1090 as above.
Do you think, you could generate two overlayed polardiagrams with both of the antennas (one after the other, about the same plotting time, about same time period of day) you're refering to? The longer in time the better, as statistics will take care for an almost "equal opportunity data gathering". Would it make easier to judge then.
Kind regards
Karl