Do you see it when you go back to the front page? I don't see what you're asking about []
If it's one of the ads on the site... they rotate out pretty regularly.
A bit too regularly, if you ask me. Often I see something out of the corner of my eye as I've
clicked on a new page... but it's gone when I go back. I don't bother searching after that.

But if you were inclined to search... http://www.rcuniverse.com/allsponsors.cfm
Eventually, you'll find it