Hi, new to the forum and PAW, but learning the ropes. I too had an issue with the PAW on the coaming and so I moved it to the rear window. The areials both have a clear view through the perspex and (hopefully) this also eliminates much of the issue wth possible interference from the engine (metal) or pilot (water) as there is rarely ever anyone in the rear seats.
Tested in flight and all works well (well, it picks up Mode S stuff, I'm the only PAW user in my area at the moment but one day I'm sure I'll have company!) I have the audio running into the rear mic socket so saves me running long extension cables to the front audio panel (another benefit of never carrying PAX!) - just need to get close enough to some traffic to see if that bit works!