Total posts : 45366
As the document linked to by wcdx states, there is little chance of interference by Smart Meters, particularly in the AM band, as they operate in different frequencies, and under Part 15 rules.
I’ve experimented with Part 15 AM both in urban (Pitt Meadows) and in semi-rural (Bowen Island) environments, with both buried and overhead power lines, and haven’t noticed much difference in the noise levels (or range). I could even hear my Rangemaster signal in the parking lot of a major concrete shopping mall (quite clearly, actually, with some underlying static) in my car about 3/4 mile away from the transmitter. That’s not to say that noise in urban environments isn’t a factor in range; I just don’t think it’s as major as it’s being made out to be.
If you’re only getting a few hundred feet range, I suspect that there is something else going on. Don’t forget that weak AM and FM signals will be heard much differently – an AM signal will start getting static introduced quite quickly, until it gradually fades away into the background noise, while an FM signal will remain quite clear and quiet until you hit the sensitivity threshold of the receiver (at which point noise will get introduced quickly and the signal will fade quite quickly as well).
I’ve had AM installations that only went a few feet, and some that went over a mile, with the same transmitter! There are so many factors in the installation that I’d look there before blaming noise levels.