The antenna I use is the stock antenna that came with the TV I bought, which is a portable Philips PT902 9 inch television. It's just a little metal stick antenna with a magnetic base that I attach to my bedside lamp. You can see the antenna and TV here:
https://www.amazon.com/gp/product/B003YONCR2/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
Surprisingly, this little antenna that extends out maybe 12 inches works better at picking up stations than an amplified Mohu Curve 50 antenna that cost $70.00 (I returned this antenna to Amazon after trying it out for a couple weeks). Regardless of what antenna I use, though, I can not seem to pick-up channel 12. I can get channel 8 and 10 if I move the antenna around enough, but not channel 12. Meanwhile, I can rely on getting KVOA NBC 4 at pretty much any angle I move the antenna. FOX 11 and MY 18 comes in great as long as I keep the antenna in a mostly perpendicular direction toward Tucson. KOLD CBS 13 and KUAT PBS 6 come in and can hold a signal, but I noticed during the monsoon storms this summer that if Tucson was getting storms, I could not pick-up these stations.
It's just surprising to me that I can pick-up stations perfectly well that are over 100 miles away on Mount Lemmon and Mount Bigelow with the San Tan Mountains obstructing my view, while Phoenix stations 15 miles away from my house with an unobstructed view of South Mountain don't come in at all. Must be the high elevation of Mount Lemmon and Mount Bigelow (over 8,000 feet). Still, it sounds like I'm not the only one with this problem!