This is the one I'm using:

http://www.maxstream.net/products/xtend/oem-rf-module.php

It's small and light with good range.

Cheers,
Zik

On 6/15/07, Adam Kt <adam_kt1@yahoo.com> wrote:
> Being a professional desktop programmer and having little knowledge about electronics and having set the objective for developing the autopilot for a kitplane. My only constraint so far left to tackle is to develop a data sending & receiving system. For fulfilling my objective, I need suggestions and directions from the learned ones.
>   Please guide...
>
>   Adam
>
>
>
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