I have a 03 f 250 superduty v 10 i would like to know how to know where to drill hole in roof and how to run coax wire to cb

what I would do is this.I would run my own coax with my own connectors and mounts. That coax in the mirror could be broke in several places and you will never find it because when you do it will be broke in another area of the wire.

If you cannot use a magnet mount antenna on the roof then a fiberglass antenna (top loaded) about 4 ft. tall mounted behind the cab on the bed rail.You can usually run the coax thru a rain drain hole in one corner of the bed. The antenna should be tall enough to where the top third of the antenna is above the roof. The taller the ant.is the better the SWR will tune.

Something like either a Wilson 1000 or 5000 magnetic mount on the roof--coil and whip unit detach as needed.

Try Grounding it better. Its supposed to equal 8.5 ft.(102 inches) but the coil may make that in all.You can clip like 1/8 inch off at time until it goes 2.1 Swr. Thats a good standard. 1.5 SWR is desired. If it don't have a coil with it that may be the problem. You could turn it into a 8.5 ft. antenna by buying a 102" inch whip to screw into the base of your antenna, it depends if it holds or not. You could build you a matcher like this with a solder gun+solder and 2 resistors. Get you a box with 2 female cb antenna inputs. Drill a hole for both Cb antenna inputs into box. Place them into holes screw nuts down snug. Run a copper wire inside to both grounds or a plate somewhat. Run a thick gauge copper wire from center cb ANT INPUT(2) to other input of ANT INPUT(1). Solder 2 100 ohms in parallel from input to Ground. If you could take apart your radio(eliminating the box idea). Just Solder 2 (100 ohm) resistors to your Antenna output then put it back together. 50 OHM MATCH HERE Is the main idea. I've used 75 OHM Tv coax and reduced SWR.

you just unscrew the coax from the back of the radio. there is no coax in the radio. Coax is the wire that runs from the radio to the antenna.

You will need a CB radio antenna, The CB radio and mounting hardware as well as the power wire.

Choose a place to mount the radio. Mount it. Run the power wires from the radio to the fuse box. Put red wire in with the fuse that is hooked to switched 12 volt. Ground the black wire to any metal of the vehicle.

Next find a place to mount the antenna. If you use a mag mount, the roof of the cab is a best bet. Run the wire into the vehicle, it can go through the door, just make sure its not going to get pinched.

Hook the coax from the antenna to the radio

Now you have to tune the antenna. this is important because if you don't you you will blow the transmit final transistor out in the radio.

This link will take you to an article that will explain how to tune your antenna.

the rails are riveted or screwed to the roof screws are easy obviously,rivets need to be gently drilled out by a drill size that just is a tiny bit larger than the hole in the middle of the rivet and drill till the top of the rivet pops off(not much drilling required,then you need to block off all the holes otherwise the roof will rust through,you may need to clean and seal it carefully

Get under your truck and look in between your cab and the pickup bed. Look up towards the back of the cab and you should find some rubber gromets. On the Ford Superduty and Chevy HD series, they have them on the drivers side back of the cab. Once you locate it...your gonna have to take the seat out, and the rear interior panel and locate exactly where the gromet will have you run the coax. Once you do, pop the gromet out and cut an X in it with a razor knife and pull the coax through it, and then to the antenna. I pulled it snug, but not tight, then I put just a little RTV silicon on the outter side of the gromet to assure no water can get into the cab. I ran the coax around the outter edge of the truck under the carpet and along the door sill (had to take that out too). Then up under the dash, and to the radio....entire installation literally took about an hour. Every full size pickup truck has some access from in cab exiting to the rear towards the bed for many different utility purposes such as: sander/salt spreader wires, generator/compressor, aux lighting, wrecker applications, strobe light bars, and etc... So if you really are having a hard time locating that rubber gromet, just simply call your local truck accessory store, and I'm sure they can tell you where it is on your particular truck...hope that helped!! Let me know

Hello there:
the shielded coax rgu-45 series is probably the best one for this application also if you run the radio to a different fuse or u can also get a surpression filter that goes on the coax line I own a WL9000 KW. i had the same problem untill i got the filter installed at a loves truck stop in texas and no more problems since ok?
drive safe and best regards mike (warner transp.)