407s work great. I have several and they will work with the faster frame rate too. The new 2 channel 210S work well too if you just need them for 2 channel applications. I use these in my offroad stuff. They work great too and are only 50$. The only difference between the 407 and 409 is that the 409 has the coaxial antenna for longer range. I have had no range problems with the other single wire antenna receivers 407 and 210.