Michael,
i've tuned a number of G5RV antennaes with good luck using several 
rigs, however never the Yaesu.  And if you can get it up in the 
clear, I think you'll like the antenna.
Pat, K9JAUAt 04:28 PM 5/30/2011, you wrote:
>Hi all:=20
>
>I purchased a 102 foot G5RV from Radio World in toronto a couple of =
>months ago as a commercial replacement for my home brewed windom.=20
>I haven't got it installed yet as the weather hasn't cooperated with the =
>times I could go out to the remote site. Plus need to drop my tower for =
>some maintenance and the couple of folks who help me with that haven't =
>been available.=20
>  I'm wondering if its an absolute that I'll require an external antenna =
>tuner for this antenna? .=20
>My Yaesu FT-450 had no trouble tuning the windom from 80/10. I have the =
>G5RV that's fed with ladder line, transformer, then coax.=20
>I'm thinking that this transformer is supposed to help with this.  =
>Should I consider winding an additional RF choak or something should the =
>tuner in my rig has difficulties?=20
>The buck has kind of stopped on my ham radio expenditures as my station, =
>remote components included has kind exceeded the 2KCAN mark! LOL and the =
>XYL has basically said, my agreement of course, I think its enough! LOL
>  So, if the rig doesn't tune this antenna, then I could be forced to try =
>and trade some components to allow the remote rig system work with my =
>back up rig.=20
>The backup rig had no problems in tuning the windom either. It even =
>tuned on 30 and 12M where my Yeasu could not. =20
>
>73:=20
>
>Michael De VO1RYN=20