Everyone seems to be ignoring the basic question being asked.

The cheaper planes come with a 27 MHZ AM transmitters and receivers. These are often very limited in range, and worst of all are only single conversion recievers. This means that the receiver only filters the incoming signal one time, and if there is any transmitted noise near the same frequency range, it gets through and the plane responds incorrectly. Just like an AM radio station tends to be less enjoyable to listen to than FM mainly due to static (Noise).

A better system will be 72 MHZ FM transmitter and receivers. Range on most of these systems are Line of Sight. You will not be able to see the plane it will be so small, but it will still be controllable. Most, but not all, come with dual conversion receivers. Dual conversion means that the signal coming into the Receiver is filtered twice. This will clean the signal so only the worst and strongest interferance will get through, usually on the same frequency as the receiver crystal. FM is a bit more stable to begin with, and add dual conversion you get a really clean signal. Making your control over the Plane more dependable. Just as FM music is more enjoyable to listen to on your radio, almost no static.

My advise to any new person is to get a radio system that will carry them down the road. A little more Expense early on can save a lot of headaches in the future. Now with the advent of the computer Radios that can handle 5 to 8 planes on one transmitter, for $200 you can buy one system. When you build a second or third or more planes, you only have to buy the Receiver and servos. One Transmitter does it all. I really like having the one transmitter to carry to the field.