Yeah I was told by the salesman at Performance Bike Shop that the higher end Polar HRM have some kind of shielding against high power lines/ cross talk/ stop lights. Unfortunately, the lowest end model he told me had shielding was in the $150+ range. I'd rather just use something with minimal features and pay in the $50 to $75 range. I'm not in a super intense training program. I basically ride as much as possible and try to keep my HR under my Lactic threshold because I'm really using it to lose weight. Plus I have a concern about letting my HR go super high.

The two ciclosport HRMs that I saw looks interesting since they were digital. Unfortunately I have not been able to find anything on the web that says digital is resistant to high power lines and such. But as Koffee says they are supposed to be. So I guess that's the route I'm going to take.

Thanks all.