Television stations in cities across the U.S. are changing their over-the-air broadcast frequencies between now and July, including two local channels—WVEC (ABC, Channel 13) and WPXV-TV (ION Television Channel 49)—scheduled to change their signal by Friday.

Nearly 1,000 television channels nationwide are transitioning to new frequencies to help open up airwaves for new high-speed wireless services, according to the Federal Communications Commission.

People who watch free over-the-air television with an antenna will need to rescan their TV set each time a station moves to continue receiving the local channel, the FCC stated. “It’s the same scan that you did to find your local channels when you set up your TV or converter box for the first time. Except in rare circumstances, no new equipment or services are required,” according to the agency’s website.

Subscribers to cable or satellite TV services do not need to rescan.

The FCC’’ Consumer Toolkit (www.fcc.gov/about-fcc/fcc-initiatives/tv-rescan/consumer-toolkit) offers guidance on TV frequency changes for people who use an antenna to watch over-the-air television.