One trick I learned with the G5RV is to make a coil in the coax you have coming in to the shack.  You can try different sizes of the coil at different points in the line, like an RF choke and it works!
Keith Reedy
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On May 31, 2011, at 10:36 AM, Steve Forst wrote:

> Mike,
> 
> Before you re-invent the wheel and turn your G5RV into a loop,  one 
> trick you can try is to change the length of the coax feed line.  It 
> helps to have a few jumpers of different lengths and barrel connectors. 
>   Add/remove jumpers in different combinations and you  should see some 
> change in the swr on  the bands.   The trick is to find the length  that 
> will let you tune a formerly untunable band, while not  making some 
> other band untunable.
> 
> 73, Steve KW3A