Isn't one of those pins the Antenna in?
Ages ago I picked up a 315Mhz transmitter (KXDJS2002.1) and receiver - these ones: http://www.geeetech.com/index.php?main_page=product_info&cPath=23&products_id=74 EDIT: Never mind, it's in one of the pictures on the link above. Rather than deleting this I'll leave it here in case anyone's googling for the same thing later.It's GND, Dat1, Dat2 and Vcc starting from the nearest edge.
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