"What types of antennas is everyone getting?" Well, here's an odd idea: I installed a pretty-small Winegard GS-2200 for someone, about 15 miles out from your stations' towers. (Yes, 4"x7"x47" is "small" in only 2 dimensions, but compared to most outdoor antennas it's small.) It works remarkably well for its size, of course it's inside the second story, 25 feet up. It's quite directional, but at 7 miles out, all your antenna towers are within 10 degrees angle anyway. At 15 miles, indoors, it had just barely enough signal. You don't need its amplifier at your distance, so you could use a Winegard GS-1100 instead.
The reason I mention it, even though you're talking indoors, is that *if* you have the proper orientation, you can actually toss it inside a cabinet or on top of a bookcase (even on top of the kitchen upper-cabinets) and thus it becomes an *invisible* antenna, just like you had with cable! Antenna guys will howl at setting one right on top of a surface instead of free-air mounting, but hey, it works. Sure, set-top antennas have gotten "sleek" these days, but still nothing beats invisible, especially if your secondary TVs already have in-wall cable pulled to them. Purchasing at Radio Shack (Regency Sq.) is certainly convenient for a return, but antennas are cheap, so I usually take the risk of eating it and order from Amazon or Solid Signal to save a few bucks.