CKLW and WJR were and still are commercial AM stations operating in Windsor and Detroit.
In the 60s CKLW was a rock and roll station and WJR was news talk and sports. I don't understand how what was installed in the tunnel between Detroit and Windsor had anything to do with part 15?

Posted by: @mark

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I don't understand how what was installed in the tunnel between Detroit and Windsor had anything to do with part 15?

Because it operated/operates under Part 15.

Leaky cable (presumably) tunnel radios systems required no licencing. They operate under the applicable rules.

But here's some brief background on the stations association to it from https://paulkarlmoeller.wordpress.com/2017/07/30/some-thoughts-on-pre-70s-cklw-radio /

" Mr. Buterbaugh has also been credited with bringing the sound of the station to the Detroit-Windsor Tunnel.60 Whether he did, or merely improved upon an existing implementation, CKLW may have been the first radio station in an international tunnel (if not WJR).61"

Moeller's citations:

**60. While we have a couple of sources claiming that CKLW was put into the Detroit Tunnel in the 1960s,  https://en.wikipedia.org/wiki/Detroit%E2%80%93Windsor_Tunnel , with History of Canadian Broadcasting, “CKLW” claiming this was done by Engineer Stewart Clark in the middle of that decade  http://www.broadcasting-history.ca/listing_and_histories/radio/cklw-am , it contradicts itself somewhat by saying it was Buterbaugh who did this, and that CKLW was the only station that could be heard. This last claim is contradicted in the Wikipedia article on the Detroit-Windsor Tunnel, which also mentions WJR as being currently heard; also with the wiring installed in the ’60s. Interestingly, Buterbaugh, though a Canadian, had left CKLW to go to WJR as its chief engineer (date not ascertained).

**61. There is a dearth of information on this topic. Happily for the tunnel mentioned, it was the first international tunnel for automobiles (as far as I can determine). As for tunnels in such cities in New York, i.e. not international, we cannot find the comparable information.

I don't know why I said presumably when I said "Leaky cable (presumably) tunnel radios systems". 

Here we go, a few more peices, and I've got articles archived, but it looks like there's a lot to turn up at the big8radio site, (excerpts below)
https://www.big8radio.com/classic_comments.html

....One memory that I have more than anything, is going through the tunnel in the family car and the only station that you could pickup was CKLW....

As for being able to hear CKLW in the tunnel, Doug Fernlock wrote in to note that it wasn't the normal CKLW signal that you heard while driving underneath the Detroit River. CKLW had contracted with Detroit-Windsor Tunnel Corporation to "wire" the tunnel. Doug asks, "Ever notice how much LOUDER it became once you emerged?" and adds that he worked at the Big 8 at the time that the tunnel was wired. I remember a sign hanging over the entrance to the tunnel saying something like "On your radio... In the Tunnel" and I believe it had the CKLW "Big 8" logo on it.]
**2021 Notes: Robin Seymour passed away April 17, 2020 at the age of 94.

...The one thing which I was surprised not to find written up on your page was reference to the coup of the engineering department in having an antenna installed in the Windsor-Detroit tunnel so that listeners would never lose the Big 8, even in the tunnel. I remember thinking that it was a unique, and very clever idea.
Again, thanks for the homepage. It was nice to see all those remembrances put together for us all the experience again.
[Jack's Note:] Carl had not yet found this comments page when he wrote (I knew this because the tunnel installation is discussed above). After I wrote back to him to let him know about this page,...

**2021 Note: Bob Bowers has since passed away. Ron Foster is happily retired from his job as VP Community Outreach at a local hospital.

For some reason I didnt think the tunnel leaky csble feed was installed until 1969, but this 1967 ad T(he Canadian Broadcaster November 23 1967 p 29) shows that it was already in operation at that time as part of their "bonus market" promotion:

"Right now, CKLW's 50,000 watts is enjoying a 15-20% share of Detroit's Metro audience.
And through the connecting Windsor -Detroit tunnel, they stream into Windsor's Wonderland to shop and cash in on the 8% money differential . . . to play at Windsor's"fabulous Raceway, at Windsor's Elmwood Casino and the many other internationally -known 'night spots' of Lucky Windsor ... 13,000,000 use the tunnel every year."

The audio feed remained being CKLW for years until sometime in the 1990s when the audio feed was changed WJR (AM 760), and I think it still is, though it appears to be broadcasting on 800 now... I'm not entirely sure.

That image converted fuzzy, here's  a clear pdf of the page

damn.. it didnt attach, let me try again

Here we go, dug this excerpt out of my archives..

He talks about the whole idea behind it and how had he had been so dissapointed that the tunnel people never bothered to use it for it's intended purpose of cutting in with tunnel advisories and such.. This really bugged him and he walked away from the project because of that..

Proceedings of the Twenty-seventh Annual Seminar on Canadian-American Relations, November, 7-8, 1985

"When I was the President and General Manager of CKLW (a Windsor radio station), I said to myself one day, "What if we could put this radio station in the Detroit - Windsor Tunnel ? Wouldn't that be a great idea so that people with claustrophobia, particularly, would have something to listen to other than their wife or friend gasping for air in the seat beside them". So I went back to the station and I challenged our Chief Engineer, Stu Clark, some of you might know him. I said, "Stu, I would like to put the radio station in the tunnel". To make a long story short, he got his overalls on. He crawled on the roof of that tunnel and laid a cable which is there today, one on one land one of the other, so that now when you drive through the tunnel you can put your dial on 800 and listen to some music.
The benefit for the tunnel at that time, what we negotiated with them, was that they would have the capability of overriding the station if there was a problem in the tunnel, so that they could plug in a cart machine or a microphone and say "Folks, the reason there is a hold up here is because somebody tried to make a u turn or whatever", so that you would not sit there wondering.
Well, the tunnel has never picked up that part of the option which really has bothered me and then I subsequently left the station and never followed it up but it was a good idea ."

-------------

You know, on a little side note he had also talked about how he invented the "6 items or less lane in grocery stores,!

Great place for leaky cable, but bad place for smuggling cocaine.. 

Trucker busted at Windsor-Detroit border with $3M cocaine cargo

https://windsorstar.com/news/local-news/trucker-busted-at-windsor-detroit-border-with-3m-cocaine-cargo

DETROIT — Yet another trucker accused of trying to smuggle high-octane cocaine into Canada has been arrested and charged at the Ambassador Bridge linking Detroit and Windsor, U.S. officials said.... reported that Singh allegedly was hauling more than $3 million in cocaine... ...Singh tried to exit the United States for Canada on Friday around 6:15 a.m. Instead, he was pulled over by U.S. Customs ...During the past year, there have been many arrests of truck drivers attempting to smuggle cocaine, fentanyl and guns into Canada. Both the Ambassador Bridge and the Bluewater Bridge linking Sarnia and Port Huron, Mich., have been hotspots... On April 20, 193 pounds was seized from a Canada-bound truck, ...In February, a truck driver was charged with suspected cocaine weighing more than 240 pounds in..

On the subject of "Tunnel Radio", Roger Skinner owned the once successfull franchise "Tunnel Radio USA" based out of florida which had specialized in AM broadcast for tunnels. 

'The Dood' however recognized his name from somewhere else - an old Art Bell episode, and it's well worth the listen, they even talk a little about 100mw 10ft antenna operations, but the topic is really about pirates and other FCC matters at the time.

It's a really cool episode, I encourage you to check it out, I listened to it again today:

https://archive.org/details/pat-murphy-roger-skinner-interview-on-art-bell-3-1998-edited

"Pat Murphy interview on Art Bell's Coast To Coast AM on Pirate Radio and the then ACE Newletter.

Later, LPFM with Roger Skinner, interview.

Recorded off-air March 1998 on Rochester, NY's 1280AM WHTK.

Radio used was a mid-70's Realistic #12-655 portable radio."

Roger Skinner.. wasnt that the guys name on the X-Files?

In this riveting seventh episode of Das Talk Podcast, host Peter sits down with Victor Bermudez and Michael Martinez from CanAm Technologies, leading specialists in communication systems for tunnels and other enclosed environments. The conversation delves deep into the nuances and challenges of creating robust communication infrastructures where conventional methods fall short.

Key Takeaways:
Innovative Use of AM and FM Signals: CanAm Technologies leverages both AM and FM radio signals uniquely to ensure that emergency communications reach drivers within tunnels...."

Try staring at about 12 minute mark where it gets more intersting.