Ferryside television relay station

Columns: Frequency | UHF | kW | Service | System
471.25 MHz | 21 | 0.023 | BBC One Wales | PAL System I | 489.833 MHz | 23- | 0.001 | BBC Mux B | DVB-T | 495.25 MHz | 24 | 0.023 | ITV1 Wales | PAL System I | 513.833 MHz | 26- | 0.001 | BBC Mux 1 | DVB-T | 519.25 MHz | 27 | 0.023 | BBC Two Wales | PAL System I | 545.833 MHz | 30- | 0.005 | Digital 3 & 4 Mux 2 | DVB-T | 551.25 MHz | 31 | 0.023 | S4C | PAL System I | 578.000 MHz | 34 | 0.005 | SDN Mux A | DVB-T

Example questions:
How many staff members does the Ferryside television relay service station with a UHF of 26- have ? | How many frames per second does the system used by the Ferryside television relay service station with a UHF of 21 operate at ? | Where is the home broadcasting station for the Ferryside television relay service station with a UHF of 21 ? | Where are the regional offices located for the Ferryside television relay service station with the 2nd highest UHF number ?

Answers:
22,000 | 25 | Cardiff | Caernarfon and Cardiff