Actually, it's not an adapter, but a modulator. It takes audio and video, and, like the coax output of a VCR, sends out a channel 3 or 4 VHF signal.

It has been my experience that, unlike a VCR, because there is no recording circuitry, the MacroVision will not affect the signal.

One thing: even though the modulator has left & right audio inputs, the transmitted signal has mono audio, so don't expect to get a stereo sound from your TV.

Larry
www.fineelectricco.com