It certainly makes sense to save money if reliable reception can be had with just the existing antenna.
But in your first post you said,
Quote:
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CIII-DT 6 (6.1) no longer receiving. Before loss, channel came in and out. This was the first channel to go.
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This strongly suggests that CIII is currently operating on real CH-6... You may want to check with the CIII engineering staff to confirm whether or not they are simulcasting on the other channels. If they are operating on multiple channels, you'll need to determine how to program your TV to use the best channel and avoid tuning an unreliable real channel. If your only option is to receive real channel 6, the CM-4228 was not doing a good job when first installed which is understandable and you'll need a VHF capable antenna.