Now is the time to rescan your TV if you use an over-the-air antenna to get access to local television stations, according to the Federal Communications Commission. Many local stations are changing frequencies to help free up airwaves for new high-speed wireless service. They are required by law to make the change. Antenna users in the local area need to rescan now to continue receiving free programming from the Detroit market of television stations. You may need to rescan more than once to get all the stations, according to tvanswers.org, which is an initiative of the National Association of Broadcasters to provide information about the scan to antenna users. No new equipment is needed to update the frequencies, and no scan is needed for cable or satellite TV users. Once the rescan is done, local TV viewers are likely to find that they get more channels, including some Canadian channels. Antennas are used by 72 million Americans, many of whom will be impacted by the switch of nearly 1,000 stations. For additional assistance in rescanning, contact the FCC’s consumer hotline at 1-888-225-5322 and press prompt number 6.