My old Vector 940 hasn't picked up Ka band in a while. It had this issue several years ago and I sent it in under warranty, the card they send back says the antenna was repaired. I also sent in my Escort 8500 X50 recently for a different issue and the antenna was replaced, leading me to think that replacing the antenna is the rememdy for many issue's.
I dissembled my Vector 940 and am wondering where the antenna is located, if I can replace it myself and where I can find a new antenna. My hope is that by doing it myself it'll be cheaper than sending it into Beltronics. Here's a picture of what it looks like dissembled;