Broadband RFI source between 20 and 28 MHz local to neighborhood. Discussions on the RFI list seemed to indicate this may one of those backyard video bulbs that sends the signal back to the receiver via the house wiring. Notice how the signal is _not_ in synchronism the same way NTSC video is _not_ in synch with 60 Hz line voltage. Both scope and Spectrum Analyzer are set to trigger from 60Hz line source.
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