Caroline, the Sounds of the Nation.

David Parr:

The best example of this is the Ross Revenge which had a huge 90 metre high mast which was a perfect quarter wave Marconi antenna for a frequency they never actually used. But the signal was excellent and the extended bandwidth gave them a great sound.

A lot of the time it comes down to the quality of audio processors used. During visits to Irish stations in the 80s I noticed most of the big stations almost exclusively used Optimod AM or Optimod FM processors to get the best out of their signal. Quality of receiver also plays a part: during a visit to ABC Radio at Waterford I listened to their MW output through an AM stereo receiver they had imported from the US (at the time they were proposing to try AM stereo broadcasts), the resulting audio was FM quality, albeit in mono. AFAIK Atlantic 252 on LW also used a single sideband+carrier to give an improved signal under poor reception conditions.

David Parr:

The best example of this is the Ross Revenge which had a huge 90 metre high mast which was a perfect quarter wave Marconi antenna for a frequency they never actually used. But the signal was excellent and the extended bandwidth gave them a great sound.

A lot of the time it comes down to the quality of audio processors used. During visits to Irish stations in the 80s I noticed most of the big stations almost exclusively used Optimod AM or Optimod FM processors to get the best out of their signal. Quality of receiver also plays a part: during a visit to ABC Radio at Waterford I listened to their MW output through an AM stereo receiver they had imported from the US (at the time they were proposing to try AM stereo broadcasts), the resulting audio was FM quality, albeit in mono. AFAIK Atlantic 252 on LW also used a single sideband+carrier to give an improved signal under poor reception conditions.