The US military with Motorola are upgrading their comunication systems to the same frequencys as garage door openers between now and 2008. It may affect you if your near a base. Some say the range is 7 miles while others say 50 miles.
http://www.cbsnews.com/stories/2004/12/06/tech/main659343.shtml
http://wireless.engadget.com/entry/1234000167022830/