BBC Radio 4 long wave will close on 27 June after years of uncertainty over the future of its 198 kHz service.
The BBC says daily on-air reminders will be broadcast to help listeners move to other ways of receiving Radio 4.
The closure is being blamed on the age of the long wave broadcast equipment, which the BBC says is reaching the end of its life.
The corporation says long wave is an older broadcasting technology, with listener numbers declining in recent years as more people use FM and DAB digital radio.
It said: “Radio 4’s Long Wave (LW) service will close on the 27th June 2026.”
The BBC says upgrading the long wave equipment is not considered cost effective for licence fee-funded services.
Guidance is being made available online and through the BBC helpline, including a factsheet on how to continue listening to Radio 4 after long wave closes.
The BBC has also reminded listeners that some older electricity meters use the Radio Teleswitching Service, which is carried within the long wave signal.
That service is run by the energy industry, not the BBC, and listeners with questions about RTS meters are being directed to their energy supplier or regulator.