Couple thoughts on this...
MH, if that guy is re-broadcasting TV then he is plainly violating FCC regs for the Amateur service and should be advised of such. The ARRL OO group should be notified. Same goes for you, LEH. If he is truly licensed, he should be giving his call sign once in a while. Go to QRZ.com and look him up, or do what John suggested. He's the guru of FCC searches around here.
And what both of you are experiencing is most likely I.F. overload, not a "harmonic", which would be a multiple of the fundamental freq like x2, x3, x4 etc. Not sure about the CBer theory as he would be using AM and that would not demodulate well on a scanner. I can't, however, think how much power he is running, anything much more than 100w at VHF gets expensive. Of course, there are many who have more money than brains...