Quote:
Basically, my reception is effected by weather; wind, rain, snow/sleet
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That would suggest that the signals are actually being affected by the trees in your signal path, especially on the UHF frequencies.
The trees will win, in your case, since you lack the ability to take appropriate countermeasures living in an apartment. The reception will only worsen as the leaves come out, assuming they're not evergreens.
Rescanning is an futile exercise if the channels are already stored into the box's memory.