DME ?

https://www.boldmethod.com/learn-to-fly/systems/understanding-dme-on-instrument-approaches-and-vfr-use/

Distance measuring equipment (DME) requires both ground-based and in-aircraft equipment. You’ll usually find DME equipment co-located with a VOR or ILS/LOC. NAVAIDs like VORs and ILS systems transmit their navigation signals over VHF. On the other hand, DME is transmitted over UHF. The FAA has matched standard VHF NAVAID frequencies to associated UHF DME frequencies.