We could factor in the Coax loss and cut the Antenna to the actual frequency. (to be exact) and correct.
OR just indicate by a formula that the Higher the Frequency the shorter the Antenna. I have seen 102 in.CB Whip Antennas used and it looks so wrong with
a Huge bow at the end. some people will always be able to buy or find off the shelf what
they want and or need. I like to Make and build. But as you said
for a static display you don't have to be exact
_ . _