'1400-1490' is a randomly ascribed slice of the dial, much like the judgement and analysis of a similar wedge of a larger pie such as, say, 'Music of 1963-1972' * would be.
But still, okay, going on THAT as a basis:
Top-40 turf wars between stations on 1410 and 1360 in the same market -- two regional frequencies with big nighttime signals -- positioned major stations as being socially and musically critical in the same years. Other here will have their own local recall; the ones coming to mind instantly are Hartford CT's WDRC 1360 & WPOP 1410, and Pittsburgh's KQV 1410 & WIXZ 1360. Toss in other 60's matters such as Norfolk's 1230 WNOR vs 1310's WGH, Atlantic City's WMID 1340 vs WOND 1400, Scranton's WBAX 1240 vs. giant WARM 590 and others, and it's evident that many upper-band stations meant that genuine 'local' commotion meant for something that mattered.
*Recent* loggings here also point out some value in two regionals of the same format still regarding their regional signal territory as important real estate. Those logs from Mobile gospel stations WMOB 1360 and WLVV 1410 are between two upper-band regionals with mean in-market and adjacent signals.
1410-1490 indeed had its share of 'upper-band' dismissals licensed to it. But that breakout also had seven bigger, regional occupants who did quite well in their heyday. Kids knew how and where to find their music when the town's big main station lower on the dial played a stiff.
* the 'decade' of 1963-1972 formed the accepted basis and playlists for the Solid Gold format.