ransley wrote:

The reviews I read by a store address the issue that some work better
in reception, and give ratings.

Most of the stations are currently broadcasting their digital signals on
temporary UHF frequencies. UHF has poorer performance than VHF. After the
switchover, many stations will use their VHF analog frequencies for their
digital channels, potentially improving their signal coverage.

Bottom line is that you can't judge your converter box performance by what you
see today.