I got my driver license @ the beginning of 1971.
Aside from 8 track tapes of "A space in Time", Almond Brother's @ the Fillmore, Johnny Winter, Santana, Procal Harem et cetera I have fond memories of listening to Beaker Street late @ night while returning from concerts in neighboring cities, states and Canada.
I recall receiving it clearly as far North as 100 miles into Canada during a major rain storm (ended up staying there after attending a concert in St. Paul, MN. as opposed to a grueling drive back to Des Moines).
The people we were staying with (met them @ the concert) said that they had never picked the station up near their home before.
Think is was the same station (maybe not) but I also recall "the night tripper" along with a repeated segment of trippy music - though not certain if it was Dr. John.
DeKay