... This map would seem to indicate that WOW would have rather extreme fading problems. https://www.fccdata.org/?lang=en&facid=50313 So it does (i.e., where their 0.5 mV/m nighttime skywave interferes with their own 2 mV/m day&night ground wave). WKZO running 5 kW directional until 10 pm contribute...

Below is a groundwave coverage map of WSCR (ex-WMAQ), using a recent estimate of soil conductivities in that area:

I saw a daytime GW contour map for WGN at that link; is there also a nighttime skywave map there (that I missed)?

Below are some observations based on the latest posts in this thread by others ... The 0.5 mV/m contour on the "Neilsen" map I posted appears to be drawn there by a source other than the the Chief Engineer of WJR. But I doubt that the Neilsen data shown there is incorrect for that time period. The ...

As a follow-up relating to the coverage of WJR in the Straits area of Michigan, below is a map from the 1960s of the Nielsen ratings showing the county-by-county "penetration" of WJR in its daytime coverage area, Notice that while the antenna of WJR radiates an omnidirectional signal, it becomes def...

CK-722 wrote: ↑

Mon Oct 12, 2020 4:42 pm

WCCW turned the tables around with their 50 kW Daytime application, measuring an extension of two WOOD proof radials, 355 degrees true and 15 degrees true. This also proves that they ...etc

Your research and reporting on all of this shows a rare and useful talent. Thanks.

Thanks for posting the data from Hatfield & Dawson. That is convincing, for sure.

... Some of the plotted radials in the applications that crossed in the Gaylord and Grayling areas were 0.1 mS/m. ... That value appears suspect, to me. Can you see anything on the map of Michigan geographical topology zones that reliably would support such a reality? Did the fields improve along t...

I have found that this map corresponds better to measured contour data from recent applications on the FCC website.... Does any translation exist of all of those detailed color zones to the units and values of conductivity useful in predicting/analyzing e-m wave propagation in the AM broadcast band...

Below is a clip from that map showing the Michigan area in detail...

Big Signal wrote: ↑

Sat Sep 19, 2020 7:18 am

... WFDF is 25KW at night.

True, and they radiate 200 kW or more toward the Straits area of Michigan at night.

Interesting list. Not surprised by WFDF 910 and WWJ 950 from the Detroit Area, those 2 stations have a direct north signal at 50 kw daytime ... Interesting that WJR 760, Detroit with 50 kW of transmitter power 24/7 and a non-directional antenna has a more useful received field in the above list cat...

GREATLAKESVET wrote: ↑

Mon Aug 24, 2020 1:47 pm

... I miss the varieties of programming from this era.

Below for nostalgia is a link to a short video about WJR in their earlier days:

https://dai.ly/x2uybs8

... What are you using to determine the field strength? Maybe Rich can chime in on this. ... Sorry, I didn't notice the recent comments until just now. The plots below give some perspective about the pattern distortion that can be produced by side-mounting a c-pol FM transmit antenna on a relativel...

... What I can't figure out is if VHF-Low stations using such an antenna were able to use the average polar gain or the maximum polar gain. ... All VHF and UHF TV broadcast stations not required by the FCC to use a directional radiation pattern were/are licensed to use the RMS gain of their antenna...