Antenna research

I never thought I'd be installing an attic antenna in 2015 but there's a good volume of free HD TV just floating around out there.  

The government has a website: http://transition.fcc.gov/mb/engineering/dtvmaps/ for checking what stations are available in our area.

In my area I'm looking at 20 channels plus some outliers:

Some of the links on Amazon list many more stations but these are all the ones that I care about.