TV reception from Boston should be very easy for you in Sterling: A simple UHF antenna on the roof, like an AntennasDirect DB4 or a Channel Master 4221HD aimed at 120 degrees by your compass will pull in everything from Boston, including WFXT-FOX, WSBK, And WLVI-CW. Frankly, WMPF is my favorite: great old TV shows and movies!. Here is a good installation guide to show you how:
http://manuals.solidsignal.com/AntInstallGuide.pdf
Unless you HAVE to have a shopping channel, you can forget about WWDP: no one gives a C%^P about it anyway...LOL: a UHF antenna will do the job just fine for you, will save you money, and will be smaller and easier to mount.
Stark Electronics is in Worcester, and You-Do-It Electronics is in Dedham: both will have everything that you need, however, Stark is cheaper.