Replace the balun, it may be gone!!!
They are cheap
have you tried another tv or other convertor box??? They may be bad due to the storm!!!

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30" syntax olevia lcd HDTV monitor, 34" Phillips CRT HDTV Monitor, Dish vip 211, Dish 622 kicks ass ( Got external Storage on 8-15-07), Dish Pvr 721 no dvr fee's, Dish 508 PVR, 121 Superdish with 508 for Milwaukee Locals, Original Slingbox on 622 and 508, Winegard HD 8200P with AP8275 preamp, Channel Master 4228 Grid 7778 preamp amp, 4 voom Motorola boxes for OTA HD
Put up antenna for OTA HD and quit whining about not having HD locals on Satellite!!!!!