"...but maybe an ad on history and travel channels would be money well spent since both channels have an audience who follow shows that deal with exploring, investigating, and treasure hunting."

A very good thought, though I must offer that complicated and expensive SEC clearances would very likely have to come first, if they can be had at all.  Then, the cost for one 30 second ad might eat up what could be had anyway.  

http://adage.com/article/news/costs-ad-prices-tv-mobile-billboards/297928/

Dunno.  Just throwing that out there.