Well, I've got my Airnav antenna kit installed now, and my immediate reaction is ..................... Looks good!! Antenna is installed in exactly the same place in my loft.
First impressions are that there's more aircraft in the list, and I don't appear to be losing contact with aircraft so often now (the trails have less breaks in them).
One word of warning - all the instructions are in German!!
Now I need to leave it running for a few days to get a decent polar chart. So far no aircraft have flown to the north of me :( This is what I've got in one hour of running.