The signal in the near suburbs was poor and even with a special antenna not as good VHF.
The biggest problem was that Channel 32's transmitter was top of one of the Marina City towers, which BTW was the studio location for not only themselves, but WCFL radio. WBKB/WLS-TV also transmitted from there until Sears Tower was built. Marina City, as far as pre-1970 skyscrapers went, wasn't all that tall. IIRC, it was a couple hundred feet shorter than the Prudential Building, which was the tallest in Chicago in the '60s.
Caray had nothing nice to say about John Allyn--many times.
And Allyn deserved every bit of it. Caray, despite his reputation for excessive drinking, was a hard worker who prepared for every broadcast. Then he hit the beers once he got to the ballpark.