Today, I installed the Easygram software on my laptop. I have used this software previously for beacon monitoring and other analysis. I quickly configured up the software and was able to see consistent traces from the transmitter. I can't see any evidence of Doppler shift on the 'steady, constant' signal, which I would expect to see if an aircraft was involved - so perhaps it is tropo after all (Having said all of that, I am listening to the transmitter whilst writing this, and I can distinctly hear aircraft scatter on it!).
Here's an example of an image from Easygram which shows a meteor ping from the transmitter. If you look closely at the image, there is a faint trace line towards the centre of the screen - this is the weak, steady signal, probably the tropo signal from the transmitter.
Here is the location of the transmitter shown on Google Maps
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