mmckenna
I ♥ Ø
Just to be clear, the first pic was using a Laird magnet mount with RG8x and an N connector. It sure seems like the magnet mount cannot use the ground plane as effectively.
I played around with comparing a mag mount to my permanent mount and saw similar results on various antennas. Key is always to tune the antenna after mounting it. But in your case/those antennas, it's not an option.