Correction:

Roy Lewallen wrote:
. . .
This is true. However, in almost all cases the loss caused by using
wire, even very small wire is still negligible. Exceptions are antennas
which are very short in terms of wavelength, particularly at low
frequencies. As frequency increases, the length of an antenna of equal
performance decreases in direct proportion. However, the loss decreases
only as the square root of frequency. So antennas of the same wavelength
size become proportionally less lossy at higher frequencies.
. . .

Loss increases, not decreases, with frequency, in proportion to the
square root of frequency. But the conclusion stated in the last sentence
is correct. If you quadruple the frequency, wires become four times
shorter for the same type of antenna. Assuming you keep the same wire
size, this length change results in one quarter the loss resistance. The
decrease in skin depth due to quadrupling frequency causes an increase
of loss only by a factor of sqrt(4) = 2. The net result is that
quadrupling the frequency cuts the total loss in half.

Roy Lewallen, W7EL