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Those are not bad units unless you get a damaged one.
What I recommend is to use a DTV box or a decent web search to find which RF channels are occupied with DTV carriers in your area, and avoid using those channels.
If you want more than one modulator get an agile modulator (one where you can pick any given channel) first, and test different frequencies, and antennas*. I would recommend getting blonder tongue BAVM-z modulators once you have found which channels work good. BAVM-z modulators come with the channel permanently fixed, but are cheaper, and come in a variety channel options. *I've had DTV adjacent channel interference prevent me from using some channels I wanted.
Shango66 has a good video on youtube on making a custom tuned TV transmitting antenna out of lamp cord that you may want to watch.
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