The station originally broadcast from a transmitter on Mount Washington in New Hampshire, the highest peak in the northeastern United States. This gave WMTW one of the largest coverage areas of any station east of the Mississippi River. In addition to its main coverage area of Southern Maine and Northern New Hampshire, it could also be seen in parts of New York State, Massachusetts, and Vermont. The station also had significant viewership across the Canada–U.S. border in Montreal, a city with almost five times the population of WMTW's American coverage area. As a result, viewers in Vermont, northeastern New York State, and southern Quebec were able to watch the full ABC schedule on WMTW. The Burlington, Vermont–Plattsburgh, New York market got its own ABC affiliate when WVNY (channel 22) signed on from Burlington in 1968. However, for some time afterward, WMTW-TV continued to have a large audience in that area (despite being difficult to receive over-the-air due to co-channel interference from Ottawa station CJOH-TV's repeater in Cornwall, Ontario). WMTW stayed on most Montreal cable systems until the early 1990s. Studios for the station were originally based in the Riccar Inn in Poland, now known as the Presidential Inn.