As the old saying goes, "There's not substitute for metal in the sky." If all your stations are from the same direction, a UHF corner reflector usually will work well. I have seen a resurgence of bowtie panel reflector antennas as of late too. If your within 30-40 miles of the transmitters, go with the panel antenna. if your farther out, use the corner reflector.
Also, avoid active antennas. The preamps they put in those things are very poor and noisy.
+-RH