Chevy454 wrote:
How effective is it to cut a one-band dipole for the highest frequency
desired and clipping an extension on one leg to get low SWR on lower
frequencies?

Would probably work with ladder-line, but not with coax.
You would be turning your antenna into an off-center-fed
dipole with a relatively high feedpoint impedance.
--
73, Cecil http://www.w5dxp.com
"According to the general theory of relativity,
space without ether is unthinkable." Albert Einstein