The Caldbeck transmitting station is a broadcasting and telecommunications facility, situated close to the village of Caldbeck, in Cumbria, England (Grid Reference: NY299425). It is owned and operated by Arqiva.

It includes a 337-metre-high (1,106 ft) guyed steel lattice mast, which is the third highest structure in the United Kingdom. The transmission antennas surmounting the structure are contained within a fibreglass cylinder.

The station was originally commissioned by the Independent Television Authority to bring ITV signals (provided by Border Television) to South West Scotland and Northern parts of Cumberland and Westmorland, including Carlisle and Dumfries using 405-line on VHF Channel 11 (Band III). Constructed in 1961, it originally included a 306.6 metres (1,006 ft) tall guyed steel lattice mast that came into service on 1 September of that year. The BBC's VHF television and radio services were carried by the nearby Sandale transmitting station.

When UHF television started in the UK in 1969, Caldbeck was selected to carry all the 625-line services for the area. The original three channel line-up came into service in September 1971. Channel 4 began from Caldbeck from its launch in November 1982. 405 line television was discontinued in the UK in 1985.

In 1993, CFM Radio launched from Caldbeck on 96.4 MHz FM, and later in 2001 the national digital multiplex Digital One entered service.

Caldbeck was one of the first transmitters in the UK to be upgraded to high power digital only TV broadcasting. The Digital Switchover took place between June & July 2009. At this time, the analogue signal was permanently switched off. Extra multiplexes for BBC Scotland and ITV Border (Scotland) were added to the transmitter at the time.

Caldbeck underwent major engineering work to accommodate the new transmitters and aerials. The work entailed complete replacement of the existing mast with a brand new 337 m (1,106 ft) mast, work on which began on 26 April 2007. Construction of the new mast structure was completed at the beginning of March 2008. Once installation of the transmitting aerials on the new mast was complete, the old one was dismantled.

Frequency	kW	Service
96.4 MHz	3	Greatest Hits Radio Cumbria & South West Scotland

Frequency	Block	kW	Operator
222.064 MHz	11D	2.8	Digital One

Frequency	UHF	kW	Operator	BBC region	ITV region	System
473.833 MHz	21-	50	BBC B	Scotland	Border (Scotland)	DVB-T2
481.833 MHz	22-	100	BBC B	NE & Cumbria	Border (England)	DVB-T2
489.833 MHz	23-	50	SDN	—	—	DVB-T
497.833 MHz	24-	50	Digital 3&4	—	Border (Scotland)	DVB-T
505.833 MHz	25-	100	BBC A	NE & Cumbria	—	DVB-T
513.833 MHz	26-	50	Arqiva A	—	—	DVB-T
521.833 MHz	27-	50	BBC A	Scotland	—	DVB-T
529.833 MHz	28-	100	Digital 3&4	—	Border (England)	DVB-T
538.000 MHz	29	4	LTVmux	—	—	DVB-T
545.833 MHz	30-	50	Arqiva B	—	—	DVB-T
570.000 MHz	33	5	LTVmux	—	—	DVB-T

Frequency	UHF	kW	Operator
490.000 MHz	23	15	Digital 3&4 (Mux 2)
506.000 MHz	25	10	BBC (Mux 1)
514.166 MHz	26+	15	SDN (Mux A)
618.000 MHz	39	3.2	BBC (Mux B)
642.000 MHz	42	1.6	Arqiva (Mux D)
666.000 MHz	45	1.6	Arqiva (Mux C)

Frequency	UHF	kW	Service
527.25 MHz	28	500	Border
543.25 MHz	30	500	BBC1 North East
559.25 MHz	32	500	Channel 4
575.25 MHz	34	500	BBC2 North East
751.25 MHz	56	10	Channel 5

• List of masts
• List of tallest structures in the United Kingdom
• List of radio stations in the United Kingdom

• Help, tips and advice as Cumbria leads the way to digital television Archived 13 January 2009 at the Wayback Machine
• The Transmission Gallery: Caldbeck Transmitter photographs and information
• The Transmission Gallery: TV Coverage Map
• http://skyscraperpage.com/diagrams/?b61323
• http://skyscraperpage.com/diagrams/?b61324
• Arqiva Caldbeck Mast Build Mini-site
• Caldbeck Transmitter at thebigtower.com