legally protected from harmful interference by MURS users. Range MURS range will vary, depending on antenna size and placement. With an external antenna, ranges of or more can be expected. Authorized modes Permitted areas of operation MURS operation is authorized anywhere a CB radio station is authorized and within or over any area of the world where radio services are regulated by the FCC. Those areas are within the territorial limits of: The fifty United States The District of Columbia American Samoa (seven islands) Baker Island Caribbean Insular areas Commonwealth of Northern Mariana Islands Commonwealth of Puerto Rico Guam Island Howland Island Jarvis Island Johnston Atoll (Islets East, Johnston, North and Sand) Kingman Reef Midway Atoll (Islets Eastern and Sand) Navassa Island Pacific Insular areas Palmyra Atoll (more than fifty islets) United States Virgin Islands (50 islets and cays) Wake Island Aboard any vessel of the United States, with the permission of the captain, while the vessel is traveling either domestically or in international waters Restrictions Transmitter power output is limited to 2 watts. The highest point of any MURS antenna must not be more than above the ground or above the highest point of the structure to which it is mounted, whichever is higher. Transmitting on MURS frequencies is not allowed while aboard aircraft in flight. Devices that use MURS must be specially labeled and certified. Products There are a wide variety of radio products that use MURS frequencies. MURS devices include wireless base station intercoms, handheld two-way radios, wireless dog training collars, wireless public address units, customer service callboxes, wireless remote switches, and wireless callboxes with or without gate opening ability. Since MURS uses standard frequencies, most devices that use MURS are compatible with each other. Most analog two-way radios utilize a technology called CTCSS or DCS that helps block out unwanted transmissions. To make MURS two-way radios work together, they must have matching CTCSS or DCS tones. This can usually be done via basic programming which almost all MURS two-way radios support. The goTenna, a digital radio product, operates on the MURS band and pairs with smartphones to enable users to send texts and share locations on a peer-to-peer basis. goTenna is not interoperable with other MURS devices, even though they operate on the same spectrum, employing "listen-before-talk" to reduce interference in the band's five channels. Notable users According to Bill Fawcett's Spaniel Journal, Spaniel pro-handler Dan