Michael:
I currently use the MaxStream 9XCite as well as the 9XStream and 9XTend. These modules work great without any flaws at all. The furthest we have been able to make them work so far is about 2 miles with the 9XTend and about 1500 Feet with the 9XCite. The 9XCite is the cheapest but does not have the build in retry functions for the error correction. This can be done using picbasic code very easily. The way it works is if the data received on the receiving end is corrupt it will be dropped and never sent out of the 9XCite module. By adding a timeout to the transmitting end you can simply resend it again if an acknoledgement is not received within a given amount of time. If you decide to use these modules I would be more then happy to share some example code with you for this. If you decide to use the 9XStream or 9XTend you do not need to worry about this, everything is handled in the module itself. For the 9XCite, choose the 9600 model for it has a much greater distance and I find 9600 to be plenty fast enough.
We have been using these modules for 2 years now and would never change to another one because of how reliable they have been.
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