It might be worth while to build a couple pole L/C band pass filter for the 6m model band.
Still About the only reasons I can see for using 6m: 1W transmitter power could be useful for drones and aircraft with 440 ATV back haul. Gain somewhat more protection from 72 MHz operators. see again the use of multiple crystal pairs. Last time I bought these for a VEX remote I got 4 pairs for $16 Same radio useful for ground and air models. People scratch their head trying to figure out what the color code flags mean when they cant see the channel plackard.

