Jeff-
As we hams know
, the more and the higher and the less-obstructed metal we put in the air, the better! If that "Clearcast" antenna is what it appears to be (some type of panel device about 15 inches by 4 inches, with a coaxial cable to connect to the TV), then it should work no better and no worse than a basic wire folded dipole (tuned to the UHF TV band) or similar item made into a shape not exceeding 15"x4".
In the NTSC days, I used to help local friends in apartments with bad TV reception by building 300-ohm folded dipoles cut for the low-VHF-TV band out of basic twin-lead wire (with a 75-ohm matching transformer for the newer TVs' coax input jacks). We would hang them horizontally near a window (behind the top of the curtains was a good place) and everyone would be amazed how much better this worked than the three or four fancy-looking amplified antenna gadgets they had tried from Radio Shack or elsewhere by then.
I live in a location between San Jose, San Francisco, and Oakland, California, and with a pair of 1950s rabbit ears connected to my 1948 RCA 8TS30 or 1965 CTC-16, I get every digital channel in the area (with a digital tuner in between, of course). Simple is often the best.