Conversation

Replying to and
Is it a Pixel 2 (non-XL)? It has a metal back, unlike later generations using a glass (3, 3 XL, 4, 4 XL) or plastic (3a, 4a) back. It makes radio reception more difficult. Try bridging the gaps across the metal bezel with a conductor and see what it does to reception.
2
Replying to and
I think the corners might be unused, so you need to skip over those gaps. Try something like joining the top to the right side. Might not impact the signal enough unless you do all of it at once though.
2
1