I remember when WGUY was on 1250 back in the '70s. Its transmitter was in a marshy field out on Route 15 going toward Glenburn --- beyond the back side of Broadway Hill, where WLBZ (WZON)'s massive tower "Bertha" dominates the Bangor skyline. WGUY was a great little station in its heyday,
but it couldn't be heard to the south or west more than 20 miles or so outside the city.
The station quickly lost most of its listenership when the Rines/Thompson clan (Maine Broadcasting), which owned WLBZ, decided to switch WLBZ's format to Top 40. They did a talent raid on WGUY and hired most of the station's DJs for considerably more lucrative salaries than they had been receiving.
That was around 1978, IIRC; for several years thereafter, WLBZ was the dominant AM station in central, eastern, and a goodly chunk of northern Maine.