Craig, Thank you! I am not a developer but I have experimented with this quite a bit. At my base without any copter interference I have tested 2 telemetry links with consistent results. It takes several meters and perpendicular mavlink antenna orientation to get my GNSS rx to perform. With the mavlink turned on the GNSS gets 3 -6 satellites, with it on I get 12-21 satellites.
On my copter I just plugged in to the (gps1 & telem1) ports, put the GPS on top and my mavlink on the bottom, 14 cm vertically apart. I can push my 915mhz out to one of the motors but my test at the base show that’s not enough. I am stuck with RTK GNSS that works best autonomously. I will keep testing and thanks again for the reply.