Actually a properly designed purpose built loop can offer a reduction in
noise from the high Q selectivity offered.
That would only be true if the receiver system noise bandwidth was wider
than the loop's bandwidth. If you had a SkyBuddy with 30 kHz noise BW and
put a 5 kHz wide loop in front, then you would have a noise BW limited by
the loop.
The only way antenna BW reduces noise is if the receiver is overloading from
out-of-band signals, or the receiver's ulitmate selectivity is wider than
the loop antenna.
While an SX99 or something that terrible might benefit with a high Q loop,
even an SX101 would not.
All good topband ops know how to put up a beverage at night.
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Topband Reflector
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