I ride near a lot of power lines (W&OD Trail in the Northern Viriginia Area). All the wireless HRM and cyclocomputers I tried have had problems due to them. Sometimes they would just cut out for a while and then start giving me readings again. Other times I would get really bogus readings (i.e., 104 mph).

It's hard to tell if you will have problems until you go out and try it.

I will say that since I switched to a *digital* wireless HRM I've had absolutely no problems with interference. Whereas before I had a problem on every ride. I got one of the Timex HRMs that specifically states that the transmission is done with a digital signal instead of an analog signal.

As for my cyclocomputer, I've just gone back to a wired model (Bike Planet 9.0). I do believe that there are some manufacturers that make a digital wireless model, but I can't remember where I read about it and I can't seem to find the link to one. If you are able to find one, please let us know because I would definitely consider going to one of those.

I know Polar and other cyclocomputers talk about having "coded" transmissions, but I'm not positive that will fix the problem if the transmission is still analog. All that is supposed to fix is your computer interfering with another computer (i.e., if your buddy is riding right next to you, you don't get his readings and vice versa).

As far as I know, the only thing that isn't affected by high power lines and stuff like that are wireless HRM/Cyclocomputers with digital transmissions.

Good luck.