George, I recently purchased a 2 pair of LINX RXM-433-LR-S and TXM-433-LR-S modules from parallax. They come with antennas and have interface circuitry for level shifting to 5 volt levels. I have used them with manchester coding and a sync pulse and have gotten distances of a few hundred feet. However the baud rate is quite slow as they tend to delay the received signal above about 2 milliseconds per bit. I am currently running them at about 500 baud manchester. Much above and they are unreliable. Don't beleive the claims of 10k baud..... However if you are set on purchasing them I would get them from Parallax, as I said they are fully assembled and ready to be pluged into your circuit. Best of luck....
Dave Purola,
George, Here is the link....
http://www.parallax.com/detail.asp?product_id=28180
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