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The Blonder Tongue aglie modulators (as well as their non-agile/fixed channel BAVM models), and other broadcast grade equipment should produce a comparable quality signal to the old OTA stations. That gear was designed to meet the transmission NTSC specs fairly precisely...Compare that to the cheap modulators in consumer gear (like DTV and cable boxes, VCRs, and even cheap standalone RF modulators marketed to those with older TVs that wanted to use DVD players or newer game consoles) which transmit the video carrier in AM double sideband mode (one of the sidebands is supposed to be suppressed) which results in a signal more than 6 MHz wide that interferes with adjacent channels and causes horizontal video ringing (faux vertically oriented horiz drive bars) in Predictas, and other sets...Or over modulation of white that temporarily cuts off the carrier, thus freaking out the FM audio demod causing buzzing.
The best part about a powerful agile mod (like the blonder tonugue models) is that with a simple lamp cord antenna (cut to be a half wave dipole at the center frequency of the channel) one can send the RF wirelesly to all the sets in ones house, or perhaps ones block if the antenna is sufficiently optimized and the output is turned up to max...No more dragging the set to the signal source or vice versa.
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