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Range and frequency are related if (as with these cars) you just whack a standard length aerial on the tx and rx ... for some frequencies the aerials will be better matched than others. In general, a higher frequency needs a shorter aerial to match.
Given that all these aerials are pretty short compared to a quarter wave whip (at 60 odd inches) then the length of aerial relative to the band probably has a bearing on the range ...
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Mike
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