Multi-strand (electrical) cable cross-sectional area

[Dellquay13]

Your ears must be quite special.

Most - See Does speaker wire affect sound quality? No Myths, Just Facts for a very typical article on the subject - don't agree that speaker cable makes the slightest difference to perceived audio quality. It's certainly nothing to do with skin-effect as the the highest demodulated audio frequency which an HF set puts out up is only around 2.7kHz. At that frequency the skin depth in Copper is well over 1 mm so will provide no effective high frequency cut off at all.

Edit: unless you mean For the Antenna rather than for the speaker (despite using 'speaker wire')? But even so, the issue is likely to be a fraction of a dB in receiver sensitivity at 7 or 14MHz I'd have thought. Much more plausible than skin-effect would be a difference in making good terminations, where the softer and more flexible speaker cable could be advantageous.

My main argument was that fine strands are better at high frequencies, and i mentioned fish finder transducers on purpose, my lowrance unit works on a few frequencies including 450mhz and 800mhz i believe.
Off boating topic but in my day job as Av engineer and sometimes recording engineer, i can hear the difference between cheap 6a copper wire and £80/100m 79strand on the right speakers. I can't hear the difference though between 79 strand and audiophile cable costing ten times as much.