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!
SeeedStudio beats 433MHz into submission to create a super-long (up to 2KM / 1.25Mile) range link! Complete with VCO , PLL technology, steady Frequency and super anti-jamming ability, it's a usable pair of modules to create a wireless data transport or remote control!
Note: Do not warp the antenna or the module will be burned!
Please visit the wiki page for more info about this product. Feel free to help improve the documents, add more demo code or tutorials. For technical support, please post your questions to the Seeed forum.
Datasheet for PT2272 and PT2262