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How to Install a CB Antenna on a GMC Sierra Pickup

Recently a customer sent in a series of images with descriptions that walk us through the installation of an antenna on the fender of a GMC Sierra pickup. This is a great example of a fender install for any fender mount. The same basic steps apply :

  1. Install the mount
  2. Run the cable
  3. Connect the radio/scanner

This installer decided to go through the door frame and route the cable under the driver side seat. We don't think this is the more common way to go, but it certainly works. It is more typical for the cable to be routed through an existing hole in the firewall to get inside the cab. Again, though, there are no set rules. Whatever works best for your situation is what you have to do. For this installation, the following was used:

 

Customer Photos of Installing the CB Antenna on His GMC Sierra Truck

Exterior shot of Fender NMO mount

Exterior shot of Fender NMO mount with Maxrad NMO base. The antenna is a dual VHF/UHF model (~18” tall)

Close up of the antenna mount on a GMC Sierra Pickup

Close up of the antenna mount without the antenna.

tight clearance between the Maxrad NMO cable and the fender of a GMC Sierra Pickup

Notice the tight clearance between the Maxrad NMO cable and the fender…

Interior shot showing the mount and the fender bolt on a GMC Sierra Pickup

Interior shot showing the mount and the fender bolt I used to secure it. I chose not to add the additional screws because it was already plenty secure and I didn’t want to put holes in my brand new 2014 Sierra.

From the front showing the installation of a CB Radio on a GMC Sierra Pickup

From the front showing the installation.

Close up interior shot of a cb antenna mount on a GMC Sierra Pickup

Close up interior shot.

routed the cable through an existing grommet in the door frame on a GMC Sierra Pickup

I routed the cable through an existing grommet in the door frame (just above the large wire run you can see in other photos). The cable passes through the outer skin of the fender the whole way to this point.

cable running from the inner side of the fender into the door frame on a GMC Sierra Pickup

Shows the cable running from the inner side of the fender into the door frame.

cable bends here just above the cable run for the door and passes through the grommet on a GMC Sierra Pickup

Hard to see, but the cable bends here just above the cable run for the door and passes through the grommet I cut.

Wider shot of the door jam on a GMC Sierra Pickup

Wider shot of the door jam.

Cable runs under the plastic door trim and out under the driver seat on a GMC Sierra Pickup

Cable runs under the plastic door trim and out under the driver seat.