Springfield channel 40

[Paul Anderson]

I'm confused about the order of things in the late '50s when WHYN-TV  
Springfield changed network affiliation and channel number.

They used to be a CBS affiliate and they used to be on channel 55.

Wikipedia says they switched from CBS to ABC in 1958 when WTIC-TV  
Hartford switched from independent to CBS, and then switched channels  
from 55 to 40 in 1959.

     <http://en.wikipedia.org/wiki/WGGB-TV>

How, then, to explain the TV Guide ad showing channel 40 (and 12  
Providence and 18 Hartford) carrying a CBS show (Top Dollar) in 1958?

     <http://www.kylebookholz.com/whct2.html>

It seems the Wikipedia article is wrong.  Can anyone provide accurate  
information?

And I've never seen information about the programming on WTIC-TV while  
they were an independent.  Any information there would be appreciated,  
too.

Paul