The QSL for NDB VTA on 345 kHz for Vitoria Airport in Spain revealed that it has a different antenna set-up from other Enaire beacons. In the info sheet I got as a QSL it shows what they call a
“Sistema radiante de tipo margarita” (which refers to the flower) as opposed to most Enaire beacons that have a dipole: “Sistema radiante de tipo margarita”.

Vitoria-Gasteiz airport seems a modest airport in terms of passenger traffic with only a few Ryanair destinations abroad. But it is the 4th cargo airport in Spain.

NDB VTA Vitoria on Googlemaps Streetview

My report was again confirmed by the folks of ENAIRE via informacion@enaire.es. A big thank you for providing me with all these details!