Suzy wrote:
I specifically want 70 cms, 435 MHz to be exact.

I have a Micronta SWR/POWER METER speced for 440 MHz.
I suspect it uses a small ferrite core rated for 440 MHz
for the current pickup and a capacitive divider for
voltage. Seems all you need is a ferrite core rated
up to 440 MHz and you would be in business. Seems to
me that even a ferrite core not rated for 440 MHz
could be used and calibrated on a one to one basis.
--
73, Cecil http://www.w5dxp.com