UK BBC and commercial radio stations containing RT in the name:
60 North Radio [60N]
All Gold Radio (Northern Ireland) [AGN]
Angel Radio (Chichester, Portsmouth & Havant) [AGH]
Barts Radio [BRT]
BBC Radio 5 Sports Extra [B5S]
BBC Radio Northampton [BNH]
BFBS (Portsmouth) (CEASED) [BFP]
Capital (Mid Counties) (North Oxfordshire) [CBB]
Capital (North East) (Teesside) [CTS]
Capital (North East) (Tyne & Wear) [CTW]
Capital (North Wales) (Anglesey & Gwynedd) [CAG]
Capital (North Wales) (North Wales Coast) [CNW]
Capital (North West & North Wales) (The Wirral) [CWR]
Capital (North West & North Wales) (Wrexham & Cheshire) [CWC]
Coast and County Radio (North Yorkshire) [CAC]
Coast FM (Northern Ireland) (CEASED) [CSN]
CPR North [CPN]
Dragon Radio (North) [DGN]
Forth 1 [FO1]
Frisk Radio (North East) [FSK]
Fun Kids Party [FKP]
Greatest Hits Radio (Berkshire & North Hampshire) [GBH]
Greatest Hits Radio (Bucks, Beds & Herts) [GHB]
Greatest Hits Radio (Dorset) (North & West Dorset) [GDS]
Greatest Hits Radio (East Yorkshire & Northern Lincolnshire) [GHM]
Greatest Hits Radio (Liverpool & the North West) [GMS]
Greatest Hits Radio (Manchester & the North West) [GMC]
Greatest Hits Radio (Norfolk & North Suffolk) [GNF]
Greatest Hits Radio (North East) (Teesside) [GTS]
Greatest Hits Radio (North East) (Tyne & Wear) [GTW]
Greatest Hits Radio (North Wales) [GNW]
Greatest Hits Radio (Northamptonshire) [GNH]
Greatest Hits Radio (Northern Ireland) [GNI]
Greatest Hits Radio (Scotland) (North East Scotland) [GAB]
Greatest Hits Radio (Scotland) (The North of Scotland) [GNS]
Greatest Hits Radio (Scotland) (Scottish Borders & North Northumberland) [GBD]
Greatest Hits Radio (South Yorkshire & North Derbyshire) (High Peak & Hope Valley) [GHP]
Greatest Hits Radio (South Yorkshire & North Derbyshire) (North East Derbyshire) [GND]
Greatest Hits Radio (South Yorkshire & North Derbyshire) (South Yorkshire) [GSY]
Greatest Hits Radio (York & North Yorkshire) [GYK]
Heart (Bedfordshire) [HBF]
Heart (Bristol) [HBR]
Heart (Cambridgeshire) [HCG]
Heart (Cornwall) [HCN]
Heart (Devon) (Exeter & East Devon) [HET]
Heart (Devon) (North Devon) [HND]
Heart (Devon) (Plymouth) [HPM]
Heart (Devon) (South Hams) [HSH]
Heart (Devon) (Torbay) [HTB]
Heart (East Midlands) (Derbyshire) [HDB]
Heart (East Midlands) (Leicestershire) [HLS]
Heart (East Midlands) (Nottinghamshire) [HNT]
Heart (Essex) (Colchester) [HCC]
Heart (Essex) (Harlow) [HHL]
Heart (Essex) (Southend & Chelmsford) [HSC]
Heart (Gloucestershire) [HGT]
Heart (Hertfordshire) (North) [HHN]
Heart (Hertfordshire) (Watford & Hemel) [HWH]
Heart (Herts, Beds & Bucks) [HLT]
Heart (Kent) [HKT]
Heart (Lancashire & Cumbria) [HLC]
Heart (London) [HLN]
Heart (Milton Keynes) [HMK]
Heart (Norfolk) [HNF]
Heart (North East) (Teesside) [HTS]
Heart (North East) (Tyne & Wear) [HTW]
Heart (North West) [HNW]
Heart (Northamptonshire) [HNH]
Heart (Oxfordshire) [HOX]
Heart (Peterborough) [HPB]
Heart (Scotland) (East) [HSE]
Heart (Scotland) (West) [HSW]
Heart (Somerset) [HSS]
Heart (South Coast) (Dorset & The New Forest) [HDS]
Heart (South Coast) (Hampshire & West Sussex) [HHS]
Heart (Suffolk) [HSF]
Heart (Sussex) [HSX]
Heart (Sussex & Surrey) [HCS]
Heart (Thames Valley) [HBK]
Heart (UK) [HRT]
Heart (Wales) (North & Mid) [HWN]
Heart (Wales) (South East) [HWS]
Heart (Wales) (South West) [HWW]
Heart (West Midlands) [HWM]
Heart (Westcountry) [HBA]
Heart (Wiltshire) [HWT]
Heart (Yorkshire) [HYK]
Heart 70s [H70]
Heart 80s [H80]
Heart 90s [H90]
Heart 00s [H00]
Heart 10s [H10]
Heart Dance [HDN]
Heart Love [HLV]
Heart Musicals [HML]
Heartland FM (CEASED) [HTL]
Heartland Radio (Manchester) [HLM]
Heritage Chart Radio [HTC]
Hits Radio (Berkshire & North Hampshire) [HBN]
Hits Radio (Bucks, Beds & Herts) [HHB]
Hits Radio (County Durham, Northumberland and Tyne & Wear) [HNE]
Hits Radio (North East Scotland) [HAB]
Hits Radio (The North of Scotland) [HNS]
Hits Radio (North Wales) [HAG]
Hits Radio (North Yorkshire) [HNY]
Hits Radio (Northamptonshire) [HNN]
Hits Radio (Northern Ireland) [HNI]
House Party Radio [HSP]
Liberty Radio [LIB]
More Radio (Worthing) [MRW]
Nation Easy Radio (Portsmouth) [NEP]
Nation Radio (North East) [NNE]
Nation Radio (Wales) (Ceredigion & North Wales) [NCD]
North Derbyshire Radio [NDB]
North East Radio Scotland [NES]
Northern Powerhouse Radio [NPH]
Northsound 1 [NS1]
Radio Carmarthenshire [CRM]
Radio North Angus [RNA]
Smooth Radio (East Midlands) (Northamptonshire & Peterborough) [SNP]
Smooth Radio (Herts, Beds & Bucks) [S3C]
Smooth Radio (North East) (Teesside) [STS]
Smooth Radio (North East) (Tyne & Wear) [STW]
Smooth Radio (North West) [SNW]
Smooth Radio (Wales) (North Wales) [SAG]
STV Radio (Ayrshire & North of Scotland) [STV]
STV Radio (North East Scotland) [STA]
talkSPORT [TSP]
talkSPORT 2 [TS2]

Irish RTÉ and commercial radio stations containing RT in the name:
iRadio (North East) [INE]
iRadio (North West) [INW]
Northern Sound [NTS]
Ocean FM (Sligo & North Leitrim) [OCS]
RTÉ 2FM [R2F]
RTÉ 2XM (CEASED) [R2X]
RTÉ Gold [RGO]
RTÉjr / RTÉ Chill (CEASED) [RJR]
RTÉ Lyric fm [RLY]
RTÉ Pulse (CEASED) [RPU]
RTÉ Radio 1 [RR1]
RTÉ Radio 1 Extra (CEASED) [R1X]
RTÉ Raidió na Gaeltachta [RNG]