Echoing other's comments ..... I participated in the Wisconsin QSO Party (in-state).
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I worked one mobile rover 5 times during the day.? Four of those were on the same Band.? He was roving through various Counties and apparently could hear me pretty well.
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The software (using Super Check Partial) will complain and warn you when entering a previously worked Call.?
But once the new County was added, it was happy.
Fred, W9KEY