Suggestions on removing the line above signatures in vB

Not sure if anyone has noticed this on their sites. In Google webmaster tools I see one of my top 10 keywords is:

__________________

It's the line of underscores that vB puts above everyone's signature. Therefore Google thinks my site is about __________________

Anyone ever attempt to remove this with an HTML element? An <hr> maybe?

It is possible and normally an hr element should be used or border should be used for signature block

I block sigs completely from guests. I wrap the whole block in an simple if condition = $show['member'].