How do you mount the device with a wire antenna? With my WM Jr I have the BLGPS ride in the ebay forward with the Raven aft. The antenna goes through a form fit hole in the forward bulkhead. It projects into the main parachute bay and I use a cardboard tube that the AT wire igniters come in, wrapped with one layer of plastic duct tape for flame resistance. Use clay or plumbers grout to seal the antenna and hold the tube to stent the wire antenna. It doesn't get smushed by the main chute then.
This technique has worked like a charm. The antenna is straight and might be off to the side in the bay a bit after recovery but gives good range. Had to strip the metallic paint off the upper bay tube and use a plain color but that's all. The paint wouldn't allow the Rf out and no range.
One could have the antenna come out aft but I believe the flopping shockcord would likely bend up the wire into something that is not really good to radiate Rf. In that case, could get a bulkhead mount
like this:
https://www.ebay.com/itm/10cm-4inch...Coaxial_Cables_Connectors&hash=item3f3c0fd6c5
Have the BLGPS ride aft and screw on a 70cm SMA antenna. Would be more robust than a wire. I am using this solution for a rocket I painted entirely with metallic paint. At least I can get the tracker "out in the open" with an aft antenna that gets deployed at apogee. The ride down and final resting place is what's important.:smile: Kurt