Check out these products. These will give you RF remote control rather easily!!

The first two links point to data sheets for an RF transmitter and a compatible receiver module. The second two links point to source where you can purchase these modules on a small PC board.

Components:
http://www.linxtechnologies.com/ldocs/pdf...ansman.pdf
http://www.linxtechnologies.com/ldocs/pdf...ceivdg.pdf

Ready Made PCBs:
http://www.rentron.com/remote_control/TXLC-434.htm
http://www.rentron.com/remote_control/RXLC-434.htm

Note: When setting out to design and build any RF product do be aware that there are legal implications. Make sure you understand what your legal responsibilities are as a designer and a product implementer. A good guide to start with is given on the last four pages of the above referenced data sheets.

Michael Karas