Broadcasting on 103.3FM from the Bow Brickhill transmitter, the station was part of Global Radio's Heart Network.

The station was later re-branded as FM 103 Horizon in 1995, following the purchase of the Chiltern Radio Network by the GWR Group, before changing back to Horizon Radio in 2006 and finally, Heart in January 2009.

[1] The name, Horizon Radio, had no real significance other than being an idea created when the station launched, due to the aerial view and 'horizon' seen from the transmitter location in Bow Brickhill, on the southeastern boundary of MK .

During the 2008-09 football season, the station's predecessor Horizon Radio secured a deal with the MK Dons football club to broadcast live match commentary for both home and away matches which continued following the Heart rebrand; the Dons competing in the Coca-Cola League 1.

[4] The station still broadcasts on 103.3 to Milton Keynes as Heart Home Counties and is no longer affiliated with Horizon Radio.