There are a lot of ready to fly and ready to run models out using 2.4 Ghz radios.  I don't understand why HL does not change their radios - or list an extra cost board to replace the 18 that would allow us to plug in 2.4 Ghz sport radios.  I would gladly spend $40 + dollars to outfit each of my HLs even without better sound.  The Clark system sounds interesting.  Hope someone imports them in to North America. jot from the stepps of Wyoming with battlefield smoke available statewide.