I've been struggling with getting reliable RF signals to the CM15A from my DS10A door sensors. After adding the f-connector and an external antenna to the CM15A, I'm almost there, but one sensor I'm having particular trouble with is my garage door. I have a DS10A mounted inside the house, with a wire extending along the garage ceiling about 25 feet to the magnetic switch mounted near the door. I get a reliable CLOSE signal in my AHP Activity Monitor from the DS10A, but I rarely get a signal when the door is OPENED. When googling for "310Mhz antenna", I got lots of hits for garage door openers. This made me wonder -- is it possible that the RF signal from the transmitter for my garage door opener generates enough RF "noise" to make the DS10A signal unintelligible to the CM15A?