I had a look in Little NavMap but I couldn’t find the “GRD” VOR that you are referring to (I have only the MSFS scenery library enabled in Little NavMap, so I only see what’s in the game). Between Malaga and Ibiza there’s a “ALT” VOR that has a 38 NM range, but the closest VOR with the ident “GRD” is in Poland (the other two are in South America and the USA).
Edit: In case it isn’t clear, you need to be within the dark blue circle that’s centred on the ALT VOR in the image below in order to be able to receive it.
