Factory Roof Anntena Holes?

[BRL]

I was told this 1969 Chevy truck was an ODG Bell Telephone Co. truck and most everything I've noticed on it indicates that is true.

When I got it 20 years ago, I removed the dome light and found an antenna wire coming from the roof area on down, but dead ended before going much further, so I just pulled it out.

But there are three plugs on the roof, and I just wondered if the factory or maybe a contractor would have done this modification?

Also has a plug hookup for I assume a trailer that I blocked with an repo rear bumper and still has traces of the ODG color located in various spots so I do believe this was a telephone truck as the seller indicated.

Sorry for the huge pics. but my Photobucket is messing with me today and I'm surprised I'm able to post any pictures at all.

Anyone know?

[dunc018]

Found this on top of my 69 after blasting. I believe that it was originally used by a local army / ammunition plant.

['68OrangeSunshine]

I have one hole in the center of the cab roof of my '68 C/10 Stepside. It was a California truck. I believe it may have originally belonged to CalTrans or Southern Pacific Railroad.
The hole is about 1/2" i.d. and is covered by a black rubber grommet that I have never messed with. It doesn't leak. Probably for a VHF/UHF stubby whip. There are old screw holes where coax cable retainers ran across the cab cieling and down the passenger side B Pillar.
No AM radio, no power accessories, manual steering, 4-Speed SM465, 292 L6, 17.5 x 5.25 Rims and West Coast Jr mirrors are clues to its origin.

The comm radio mods were not factory, possibly done at the dealer level, but more likely a specialist communications subcontractor was involved, unless a big outfit had their own Radio Shop.

[BRL]

Thank you for the replies.

Yea I just always wondered about who would have made those holes and thought I would ask here.

As far as I can tell, mine don't leak either, and here in WA. that is pretty amazing!

I'm going to leave them alone for now.

Thanks again.

[JJorgensen52]

As to the trailer plug, that is a (then) common 6 plug trailer connector - it was used for heavy duty trailers before the advent of electric trailer brakes. They were available as a factory RPO option or installed by a dealer - my truck had one in the same spot but it was done by the PO, not a dealer.

['68OrangeSunshine]

There's also the possability that my cab roof center-mounted hole was for an Amber Gumball Machine [rotating flasher] and not a 2-Way radio, which might have had a long whip somewhere else.