Owen Duffy wrote:
... another has told you that the VSWR
on 450 ohm line will make it unattractive...

Not unattractive, just less attractive than if
it was a matched line case. I feed my 20m rotatable
dipole with 300 ohm ladder-line and put up with the
SWR loss in order to gain 20m/17m/15m/12m/10m
operation.
--
73, Cecil http://www.qsl.net/w5dxp