If you are a Ham, then you can use radios on the 50mhz band (I hope I got that one right). To get one, just order it that way. You might be able to get an existing radio moved over to that band, but most receivers can't be re-tuned that far, so you'll need new RXs. There are 3 Hams at my field, and they all agreed on who gets what frequency, so they never have to wait for a pin.

I've also heard about the upgrade to the A-10, but the new one I just got for xmas appears to have the EDF-50. Btw, I find a 720mah 8 cell nimh pack makes a world of difference in the flying. It can cruse level at just under half throttle, and while a loop still requires a dive entry, it's not nearly as hard to do. Rolls are a lot easier with more power as well. And I've even done inverted passes with it.