[ADTech]

If KNTV is being received without defects, the displayed signal meter is irrelevant, it only needs to be "good enough". Indicated quality is probably being reduced by either multi-path or localized electrical interference. Are you looking at their VHF channel 12 signal or their channel 49 sub-channel on KSTS?

Is KGO being received on its channel 7 or channel 35 signal, if you can determine? They have two transmitters and both are within your reception envelope.

KCSM is most likely suffering from multi-path interference. Move the antenna and try again. Look for a spot where KCSM works without breaking something else. You could also try a reflector. For an experiment, place a flat metallic item (cookie sheet, baking or oven rack, foil-covered cardboard, etc) about 4-5 inches behind the loop in a plane parallel to the loops and see if it improves. If it does, we have the reflector available as an accessory item.

The reflector would be expected to improve KRCB a bit also, but it's > 60 miles away and its signal is going to be significantly affected by the inversion layers that frequently form over the Bay area.

You'd also benefit by getting the antenna outside and up in the air where signals could more readily get to the antenna.