Serial Filtering

Hi- I am using basic RF modules. You put serial in one, get it out the other. However, when nothing is being transmitted, the reciever get a bunch of serial "jibberish". How can I filter out only what I actually need?

Yeah, you're going to have to tell us a bit more than that.

Say I want to send a series of characters. 'Arduino' for example. I transmit 'Arduino', I get some jibberish with an 'A' mixed in somewhere. When I am not transmitting I get somthing like "@^#%&^GKU#&Arduino*$(&Q&^$(F^&r6" on the reviever. How do I filter out just that series of characters?

No, really much more than that. Code, module specs, boards. The Full Monty.