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I've used the older CATEL CATV head-end modulators to do in-house broadcasting, they're much cleaner than the typical VCR RF modulator and most of that head end stuff has an output greater than +10dbm and with a good Winnegard or B-T distribution amp +30dbm... a full watt. Personally I wouldn't go this high simply because one its illegal and two unintended reception by the neighbors.
Plenty of that stuff floating about from the hotels and others who have made the move to QAM digital for their internal distribution.
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