Yeah, this is a crazy one.
My wife's garage door opener stopped working yesterday. I replaced the battery and it works when very close to the garage door receiver, like underneath.
Today, my son tells me his garage door opener isn't working. His is 2 weeks old and opens a different door (not the same as my wife). It works when you elevate it to the window and a few feet from the receiver.
So I tested mine, the same door as my son, and it took has a extremely limited range. I could not open the door unless I held the opener up high @ the window.
Previously, we could open the door at the top of the driveway, at least 30 feet away. Now, unless it is in line-of-sight with the receiver, the receiver doesn't receive.
The only thing different is my operating an end-fed @ 100 watts on 40 meters. Prior to my operating @ 40 meters, the garage door receiver had a decent +30 foot range. Now, it's practically deaf.
The low receive occurs when not transmitting, like tonight, when we went out to eat. This is when my son told me his door opener doesn't work.
So ... did my amateur radio operation permanently damage the garage door receivers?