I got the antenna mounted on the inner fairing shelve next to the shield and can't really say I've lost reception and if I did, it was only for a moment or two.

 

Are there any trees in Jersey?

Seriously had mine set up the same way and most tree cover knocked out the signal. I now have the antenna mounted in between my windshield bags. Works much better but heavy tree cover still knocks it out sometimes still but just for a couple seconds or so.

 

I have a larger antenna that came off of another unit, connector is the same, so thought I'd, plug it in, stick the antenna on the tour pack and see how it works. If it improves, I'll route the lead where it needs to go and use some double sided tape to mout the antenna to the inside of the tour pac lid :-)