With the limited information you have provided I am going to guess that you purchaced an ARF Trainer style airplane. In general those planes only require 4 Channel transmitters and some will require 5 servos while most require 4. The 5th channel is for retractable landing gear; so if your model does not have retracts than a 5 Channel will do you no good. A 4 ch model with 5 servos is set up like this:
Channel 1 - Alerons 2 servos linked with a "Y" harness
Channel 2 - Elevator 1 servo
Channel 3 - Throtle 1 servo
Channel 4 - Rudder 1 servo

Thus any 4 Channel with an extra servo and "Y" harness will work for you. This is short term cheap only as this hobby dictates you will have no choice but to get more planes in the future and spend all of you extra money doing so; even going hungry and hitch hiking now and then to save a few bucks to spend on more R/C stuff later. So here are a few options:

Cheap: Radio http://www2.towerhobbies.com/cgi-bin...I=LXEFJ4**&P=0
extra servo http://www2.towerhobbies.com/cgi-bin...?&I=LXVW07&P=M
"Y" harness http://www2.towerhobbies.com/cgi-bin...?&I=LXL307&P=M

Cheaper in the long run: Radio http://www2.towerhobbies.com/cgi-bin...I=LXGAF1**&P=0
Then you can use the same extra servo and "Y" harness above with this and use the ODD servo for your throttle.

Good luck and I hope this helps.


He who dies with the most toys wins!