My archer transponder antanna cam in and I made a set of u brackets to mount it. I used 4 layers of BDM glass laid up in some PVC. I used mixing sticks to get the sides straight. I measured things up and laid up the u brackets and glassed them in. They were a little slippery and it was tough working back in the cone with Bulkhead A in. I also installed the bulkhead A brackets.