Based in Hatfield Road, St Albans and promising "classic and contemporary hits, sport, local and national news", Oasis Radio went on-air on 22 October 1994 as a complementary sister station to Chiltern Radio (Herts, Beds and Bucks)- both stations being receivable in its target area.

Capital Radio started selling advertising space on behalf of the newly relaunched station, which moved to the Christopher Place Shopping Centre in St Albans.

This was due to the then Radio Authority regulations on local ownership of stations as the GWR Group already owned Chiltern FM, which has overlapping coverage in the St Albans and Hemel Hempstead areas.

Despite its relatively independent status, the station was rebranded from Mercury 96.6 to Heart on Monday 26 July 2010 and switched to a softer adult contemporary music format.

In July 2016, the station owners Adventure Island signed a management contract with Communicorp that would see them offer extra support to both Heart Hertfordshire and Connect FM.

[1] All networked programming originates from Global's London headquarters, including Heart Breakfast, presented on weekdays by Jamie Theakston and Amanda Holden.

Local programming is produced and broadcast from Communicorp's Watford studios from 4-7pm on weekdays, presented by John Darin.