Thanks for the reply. I decided to go with a antenna from Radio Shack, for this allowed me to try it out and return it if it didn't work as expected. I ended up with the antennacraft HDX1000.
http://www.radioshack.com/product/index ... Id=3740644A bit more expensive, but it is way more attractive than the standard wire nest antenna, comes with a signal amp and I simply put a stake in the ground next to the cable-in connection spot on the side of the house, pointed the antenna towards seatac, and I get 22 or so channels with strong signals! Goodbye Comcast, hello antenna!