This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Yes. You can use one of the methods described above, or (for TV's with an S-Video input) some module for converting to S-Video (e.g. Video Turtle); or, you can use the RF Modulator module especially designed for the IIc series. The IIc RF module is formed to fit the IIc case and has a "CH3-CH4" slide tab on the top. Once the module is plugged in and a cable run to the TV's antenna inputs or to a TV/Game switch, you can get very nice, colorful on-TV hires and double-hires displays.
 
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