I've been into rc planes for little over 2 years now and I'm getting more and more into slop soaring I currently have two zagi's both LE's that me and my gf mess around with the only thing is i've got one radio between them so i constantly have to switch out everything. well i was looking into getting a new receiver to start off with and i was seeing all this "channel 30 and 40 etc" buisness do i have to have the same channel for my transmitter as on the receiver or if they're both 72mhz it doesnt matter?
and if the channels have to be the same how do i know what channel mine is

Yes you need the same "Channel" (frequency) if you want one TX to operate both model.

A Receiver will cost you around $50...

A Hitech 3 channel system (with the correct servos, reciever and another transmitter...) is about $80.... You can get a Hitech 4ch or better system with the correct servos and receiver if you special order...

With 2 full systems on different channels... you can both fly at the same time. Follow the leader or tie on streamers and do "combat"... all kinds of stuff to do.

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In the reciever is a small silver thing with a tape flag on it. that is the "Crystal" Pull it out and the writing on the flag tells you which channel number it is... and what the frequency is. It slides right back in. (The reciever will not work without the crystal.)

If you are switching ALL the radio stuff, yeah, I'd suggest getting a Hitec Laser 4 with the two micro servos, for 114.99 from Tower. Or at least a 3 channel....... If you are just switching the Rx, then the little crystal with the tag will have your channel. Get another Rx, and use the same crystal number (channel) to use the same Tx.
You'll be happier if you get them both flying at once though!

Jetts