Originally Posted by nybbler
The CM4221 is no good on Channel 10. In Philadelphia, with an analog channel 10, I get a poor and snowy picture from my 4221. A simple curved folded dipole (the VHF section of a gutted Terk HDTVo) works fine, though.
Depends on the signal strength and his distance to the digital channel 10 broadcast tower. I get a WWPX-DT Ion/Pax station on VHF 12 at 46 miles with a CM 4221, but it is one of the odd stations that comes in stronger than expected. I also get decent picture quality for the Washington DC analog WJLA 7 and WUSA 9 stations with the CM 4221, but those are high powered stations at only 16 miles. But I get lousy picture quality for the Baltimore analog WBAL 11 and WJZ 13 stations at 43 miles. If you look at the charts for VHF reception for the CM 4221 at hdtvprimer.com, it has some gain at VHF 13, but falls off rapidly down to VHF 7. The CM 4221 can work for VHF 11 to 13 if the stations are close by, but, yes, it is a limited antenna for upper VHF use.
xrdan, just how far are you from the NBC digital channel 10 station and what is the call sign for the station? If you give us your zip code, we can look the station up and what power it is at. If you are getting the station with drop outs with the CM 4221, you may be able to simply add a rabbit ear or simple dipole antenna which will have more gain for the upper VHF station along with a VHF/UHF combiner. arxaw enclosed a photo of one of the Winegard YA-1713 or YA-6713 upper VHF antennas which you can get if the rabbit ears don't work. I have been thinking of experimenting with adding a rabbit ear / dipole VHF antenna to my setup as I will have the four upper VHF stations in DC and Baltimore that I listed above switching to upper VHF in 2009. Easy and inexpensive experiment for me to do.