Highland Ham wrote:
Cecil , Great antenna web site . Intent to implement your 'no tuner' dipole with 450 ohms feeder by adding bits of feeder operated by relays with quadruple change over contacts.
I assume it is alright to build the lot in a box made of MDF with the 450 Ohms ribbon coiled up.
An open perspex sheet would be somewhat difficult to accommodate in my shack.

The only way to coil up 450 ohm line is to keep all
parts of each coil at least 3-4 inches from all other
coils. A spiral will work but you certainly *cannot*
successfully coil up balanced ladder-line as you
can with unbalanced coax.
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73, Cecil http://www.w5dxp.com