Birdseye
http://aasalarm.com/Here is the system which my co-worker really likes. His only negative feed back from the owner is, the owner replaces batteries every six months. I believe he uses it to protect a business, so heavy traffic may be contributory to the short battery life.
I don't want to take any business away from X10, and this is their site. But the SC1200 *seems* to have issues that a secuirty system should not have. I know this AAS system is protecting an out building 200 feet from console.
FWIW
I think a system using "spread spectrum" for their wireless transmission would be most resistant to "flooding". But unless you live in a mansion that says "huge wealth stored here" I really think you are worring about an unlikely event.
Unless he knew the exact security system, a burgler would need a spectrum analyzer to detect what frequency the security remotes transmit on. To do that, he would have to wait for a "check-in" transmission, or purposely trigger a remote (motion sensor?) to find the frequency. Then he would need a tunable transmitter to tune a "flooding" signal to the same frequency and transmit the signal close to his entry point. He would also have to contend with the possibility that the system is smart enough to detect the interference as a threat and trigger. This ain't the stuff a typical "I need a hit" burglar would be carrying around.