Well, I am in Connecticut, USA. Yes, there is a parking lot with alot of cars parked outside, and yes there are alot of things moving around inside the building. So is it safe to say that it's a combination of the air characteristics, and the succeptability of the signal to reflective objects that interfere with reception ? This makes sense now that I consider that RF is essentially photons at a particular frequency (just like visible light, gamma, x-ray, or any other frequency in the electro magnetic spectrum...