HI Gary,

If you have read the excellent Article by Cebik you should take a look
at it you can find it at http://www.cebik.com/wire/g5rv.html

The best thing if your using 450 ohm window line would be the ladder
grabber think you can get it from the Wireman www.thewireman.com

the 70' of coax helps on 3.5 mhz but i'm with you keep it as short as
possible.