You want to make this thing talk to that thing waaay over there? Try the SeeedStudio super-long range 433Mhz RF link bundle! They're claiming 2KM range for wireless data transport & remote control use!
This small key fob transmitter / receiver pair has 4 channels and a range of about 200'.
This receiver type is good for data rates up to 2400bps and will only work with the 315MHz transmitter.
This is only the 315MHz transmitter. This will work with the RF Links at 315MHz at either baud rate. Only one 315MHz transmitter will work within the same location.