BBC Three Counties Radio in Luton on 630 travels a very long way, despite only being 200 watts, and aimed at Bedfordshire, Hertfordshire and Buckinghamshire it's audible across a fair bit of southern and central England due to the clear channel.
I'm about 80 miles away and it's weak but perfectly audible in daylight. After dark it gets drowned out by 621 (Belgium) and 639 (Spain), although a better receiver than mine might be able to split it off.
Eventually 630 will probably close as the FM coverage of 3 counties is also good. It's the local service for much of the northern half of the London commuter belt, and my station of choice when driving down the M1 to London, which I do semi-regularly.
I remember that 630 very clearly. The day signal was fair, but very reliable and listenable at my usual London Hotel (Grosvenor Square Marriott). At night it was gone, for the reasons you stated. I'm also familiar with the Three Counties intended service area. My reps who worked for me were in Berkhamstead, which I believe is not far from where you are. I used to make the trip up there from Euston station at least once every time I visited. Sometimes more. Trains ran every hour, and the journey took a little over a half hour. Lovely place, and I always looked forward to it. One of those reps, who lives in Tring, is still a Facebook friend, so I'm in regular contact with him.
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