If you have an HD100 (not sure if SD100 is a typo) then go to the menu, select the top left item (can't remember the name), select antenna (2nd down if I remember right), there should be another selection on the left for antenna, then select the second option which should be the OTA antenna. From there you will be able to select the digital channel (not the remaped channel) and see the signal strength.
Sorry for not remembering the exact menu names, I am out of town and not near a unit. It is under the same menu with the sat signal strenth. Hope this helps.
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