I did a roof install today for a nice older gentleman who had bought a combo UHF/VHF antenna of a dubious brand name. The antenna had an integrated amplifier and rotator.
Of course I discussed the cons of buying such equipment, but the antenna was affordable for this cash-strapped pensioner.
Surprisingly, the antenna turned out to work reasonably well. The one concern I had though is that it used non-standard cable and connectors on the 50' or so of cable that was provided between the antenna and control box (rotator control, signal, and pre-amp powering). This of course makes grounding and lengthening the cable run difficult. (the cable is smaller than RG59--probably what's known as "mini" coax).
Further, the rotator control had no direction indicator. You can rotate, but have no idea where the antenna is pointed.
The caveat here: If you're considering a "junk" brand (and I don't recommend it), avoid any models that use hard wired non-standard cable and/or connectors!
DMX 68' tower, HyGain HAM 5 rotator, Antennas Direct DB8e & C5, Channel Master 7777 preamp, Siemens surge protection. TiVo Roamio DVR