OK, time to roll out a blast from the past: The FCC's Sixth Report and Order. Google search brings up a link to that doc from a known quantity here:
https://worldradiohistory.com/Archive-BC/BC-1952/BC-1952-04-14-Pt-II-TV-Freeze-Lift.pdf
This was a super-sized edition of Broadcasting magazine from 1952 which reprinted the Sixth R & O in its entirety. Scroll down to about page 50 to get into the midwestern proposals and conclusions.
This gets my vote for one of the most interesting OT threads ever.
I was aware of much of what's been discussed here, but never knew there was quite a bit more to it.
So my question is this....Was there any connection between these moves and the shift from WOC-TV in Davenport, IA from Ch 5 to Ch 6? My understanding was that was to alleviate intereference with NBC's WNBQ Ch 5, Chicago (now WMAQ-TV), I beleive that move also had the effect of opening up Ch 5 for WOI-TV in the Ames-Des Moines market. Allocating Ch 6 to Milwaukee may have also been another "falling domino" involved.
Orange County, TX, Days KLCL Lake Charles, LA nights KYYW Abilene, TX usually stays on top of the mess
It was proposed to drop in Channel 11 to Grand Rapids, MI. That didn't happen, but WGVU Channel 35 now occupies digital physical Channel 11.
Channel 13 didn't fit in very well into Grand Rapids either. They had to put the transmitter way out NW and almost didn't put a City Grade Signal over the COL. It also didn't serve Kalamazoo and Battle Creek like 3 and 8 did.
I didn't see the details, but I suspect that 11 would have been forced to locate far North of Grand Rapids, and perhaps required WBKB-TV 11 Alpena (that's where the call letters were recycled to, "Toddlin' Townies") to be considered to be a limited directional and HAAT allotment. And of course there's WTOL 11 in Toledo. Whatever 8 in Knoxville, WTVK...WVLT, was, it was required to be a DA limited allotment.
Channel 13 didn't fit in very well into Grand Rapids either. They had to put the transmitter way out NW and almost didn't put a City Grade Signal over the COL. It also didn't serve Kalamazoo and Battle Creek like 3 and 8 did.
I didn't see the details, but I suspect that 11 would have been forced to locate far North of Grand Rapids, and perhaps required WBKB-TV 11 Alpena (that's where the call letters were recycled to, "Toddlin' Townies") to be considered to be a limited directional and HAAT allotment. And of course there's WTOL 11 in Toledo. Whatever 8 in Knoxville, WTVK...WVLT, was, it was required to be a DA limited allotment.
Reminds me of the E-W pattern for CBS affiliate WLFI 18 Lafayette, crowded by the Indianapolis CBS affiliate to the ESE and Milwaukee's 18 to the north (about 188 miles). Extremely hard to DX from the Chicago area.
My head hurts looking at that. But yes, the switch of WOC from 5 to 6 does exactly as Cyberdad said, clearing north central Illinois of interference (the midpoint between Chicago and Davenport is about Compton, Ill., in today's Rockford TV market but in the 1950s a haven for big antennae aimed east and west on big towers, and where even today one company advertises towers to watch Chicago, Rockford, Quad Cities and Peoria TV) and allowing clear views of WNBQ on 5 and WOC on 6, plus allowing WOI to transmit on 5 in Ames.
Great find!
Same deal why WBBM moved from 4 to 2. Not only to open up 4 in Milwaukee for allocation, but also clear the interference in north central Illinois with WHBF-TV Rock Island.