Well, the Polar s210 sure ain't the answer. What good is a max HR function, when every time you get near power lines [Sam Kinneson voice] YOUR #@*&% !~$#& HEARTRATE HITS 234? GAWD IT P!SSES ME OFF![/Sam Kinneson voice]

Actually, it's weird. Some days it's awful, other days I won't have any trouble at all. Same routes, same power lines. Maybe weather? My condition? Sun spots? Phase of the moon?

I do think that you're more prone to problems if the transmitter strap battery is low, or the strap isn't sufficiently moistened. I'd probably ebay mine in a heartbeat (pun intended) if I heard of another that didn't have the problem.