Does anyone make a telescoping HT antenna meant to operate (1/4 wave)
over a broad band of frequencies with marking for those frequencies?

Most HT's can be modified to operate outside the amateur bands, like on
GMRS, MURS, FRS, etc. But I don't like doing this without a proper antenna.

It would be simple enough to make a 1/4 wave telescoping antenna with
calibration marks for everything VHF and UHF, just extend it to the
right length. It would have an easy way to set it to the right length.
Does anyone make an antenna like this?

TNX,
Bruce AF8F