So I bought a vintage Fuzzbuster (circa early 80's) pic below for kicks. One of the 1st units I ever owned. Got it in the mail today and just for fun plugged it in and went to the grocery store. Now I know exactly where my X50 goes off when I turn into the parking lot - but I swear the Fuzzbuster picked up the signal about 10 car lengths before!!! I even went around again to check!
Now I am HOPING (surely) that this is because the X50 has 25 years better filtering, and thats why the alert from the doors is not picked up sooner. It freaked me out! Surely a 25 year old fuzzbuster would not beat the X50. I believe the grocery store band is K.
So help me calm down and feel better about my trusty old X50!