the airwaves around Nerja are very crowded and we fond our own signal being interfered with frequently by other radio stations. The geographical area suffers from the same problem as other broadcasters overlap each other's transmissions just outside their own zones.
The Nerja area is also under scrutiny from technical operators who analyze the spectrum to make place for digital TV.
In conclusion the advice for the only solution against many obstacles was a change of frequency, resulting in a less crowded space and a better signal.
This situation is a fact of life that will not change much unless
local, regional, national or even European regulations offer a better proposal.