WMEX was founded in 1934 by Bill and Al Pote, with studios in the Hotel Manger, and was originally on 1500 kHz with 500 watts daytime, 100 watts nighttime. It broadcast from a transmitter site on Powder Horn Hill in Chelsea, and later (1940–1981) from a site off West Squantum Road in Quincy, near the then-WNAC/WAAB (now WBIX) site in the Neponset River Valley. The station made its debut on October 18, 1934. On April 5, 1936, WMEX moved its studio and offices to 70 Brookline Ave.