I'm now a lot more into this. Your Clearnav, LXNAV, FLARM antennae are all exactly the same as that 300 buck antenna in terms of spec and performance.

BTW if you're really into TSO'ed equipment, don't buy the $350 TN 72, but the $2000 TN70, which is functionally almost exactly the same... but TSO'ed.

Your choice!