Loss isn't an issue - you're already running hundreds of feet from the street to the house and around to the cable jack. If you called Shaw to put in a new outlet near your TV, they'd run exactly the same cable from the main splitter to the new jack.
That's Active Components at 1st & Boundary. They're not as likely to have it. RP Electronics on Rosser just off Lougheed is more likely to. This is exactly what you need:
http://www.rpelectronics.com/rg6u-10...0ft-black.html