|The BBC's transmitter site at Droitwich.|
Listeners are being advised to switch to digital platforms while the long wave antenna and the masts that support it are refurbished.
Droitwich is the Worcestershire home of the main BBC Radio 4 198kHz LW transmitter, serving much of England, Wales and the near continent as well as BBC Radio 5 Live's MW service on 693 kHz for much of the Midlands and East Wales.
Work will commence from Saturday 29th March 2014 and is scheduled to last until "the summer", according to the BBC.
- BBC Radio 4 LW will be subject to shutdowns between 10:00-17:30 during this period, exact times will vary.
- BBC Radio 5 Live will be subject to reduced power, with daytime transmission being moved to a nearby temporary transmitter at Kenilworth.
According to the BBC, the disruption to services is "to enable engineers to work safely, while refurbishing the long wave antenna, and the two masts which support it."
During the affected times, BBC Radio 4's output on 198kHz, which between 10:00 and 17:30 includes the LW-only midday shipping forecast, will be broadcast on Sky, Freesat and iPlayer Radio. Any cricket coverage scheduled during the maintenance periods will be available via BBC Radio 5 Live Sports Extra on digital radio.
BBC Radio 4 198 LW from Scottish transmitter sites will be unaffected, enabling ongoing reception via long wave in many parts of the north of the British Isles.
Listeners affected by disruption to BBC Radio 5 Live's service are being advised to listen via DAB digital radio, or via Freeview, Freesat, Sky, Virgin Media and iPlayer Radio. Listeners in central southern England who listen via 693 kHz may find better reception on 909 kHz.
There has been no suggestion that the BBC will close any of its national AM radio services, with services returning to normal after the completion of the work in the summer.
updated: 26/03/2014 18:27