How to install base antenna outlander - 2010 Mitsubishi Outlander

1. Remove the antenna mast from the antenna base. Grasp the antenna mast near its base and twist it counterclockwise to remove it from the base.
2. Remove the antenna base cover. You can use a flathead screwdriver or a plastic trim removal tool to gently pry the cover off.
3. Disconnect the antenna cable from the booster. There will be a connector attached to the booster. Gently unplug it to disconnect the cable.
4. Remove the old booster. It is usually held in place by a mounting screw or adhesive. If there is a screw, use a screwdriver to remove it. If there is adhesive, carefully pry the booster off with a flathead screwdriver.
5. Clean the mounting surface. If there was adhesive holding the old booster, use a cloth and some rubbing alcohol to clean the surface where the new booster will be attached.
6. Install the new booster. If it comes with a mounting screw, align the booster and screw it in place. If it comes with adhesive, remove the backing and carefully attach it to the cleaned surface.
7. Reconnect the antenna cable to the new booster.
8. Reinstall the antenna base cover.
9. Reattach the antenna mast to the antenna base by twisting it clockwise.

I don't own an Outlander but going by Pajero I suspect it is similar. On the inside of the door you might see a plastic triangle which covers the screws securing the mirror through the door frame. Gently pry away this plastic part (or unscrew, I don't know), then you will see the fastenings of the mirror base. Also you will find an electric connector. First separate the connector(s) if possible, then unscrew the mirror base. If you don't see the connector, the cable of the mirror may be routed downwards behind the inner door cover, there you go.
Note of caution: Never understimate car designers, the solutions they find to hide fastenings are sometimes "outlandish".

You will have to un-install the entire antenna system from the inside.
remove the panel carefully adjacent to the antenna system
undo the bolts and clamps that hold the system in place
you can try and install the new antenna piece without disconnecting the transfer wire that goes back to the radio. But usually you will need to get and install a new system.
just to keep you going in the mean time you could just use a old wire coat hanger "classic" just bend the hook straight and shove it in, you have your sounds back.
all the best

How do I install a new antenna on my GMC 05 2500 Sierra. I have to replace the base because it broke off. I've taken the dash off. But cannot seem to fish wire through the firewall.

When in doubt, if it's a block heater, I usually look under engine block for cord attached to heater, then follow it forward. A quick call to dealer may save a lot of aggravation though, I'm sure they will tell you.

1. Disconnect negative side of battery.
2. Wait at least 2-minutes to de-energize the airbag system
3. Remove the glove box from the dash.
4. There will be a coax cable towards the top of the opening. Disconnect the antenna cable lead.
5. Remove the right kick trim panel. There should be no screws just clips.
6. Loosen the rubber grommet insulator from the door hinge area. This is a rubber accordian style guard for wires located between the "A" pillar and the door.
7. Pull the antenna cable out of the dash area to the hinge area.
8. Jack up the front right of the vehicle. Support with Jack Stands. Do not use only the Jack! Use the jack as a back-up in case of Jack Stand failure.
9. Remove the right front tire.
10. Remove the right front wheel housing splash shield. There should be 3-push type retainers and one 10 mm bolt below the bumper.
11. Slide the plastic cover (on the base) up on the antenna mast.
12. Use a open end wrench to unscrew the antenna mast at the base and remove the antenna mast.
13. Remove the plastic cap from the base nut on the base and remove the base nut.
14. From underneath the fender: pull down the antenna base. And pull the cable towards you - out from the door hinge area into the fender area.
Good Luck! Installation is reverse of above.
If this helped or you need clarification or additional help: let me know at fixya.com

Remove the clamshell cover from the column (philips screws)

Press together on the top and bottom levers on the headlight switch base and pull outward.

check it out w/dealer and some mitsubishi seems like there is an issue with some corrosion in the antenna base on some models from 2007. Under warranty replaced the antenna base.

its held in by the bracket on the botom of it and also the chrome nut arount the top of it... remove the nut from the top and the bolts from the base support bracket and then remove the antenna and power wires.. when installing replacement antenna secure the top nut first. then bolt base and reconnect antenna wire and power plug

try tapping lightly on the base of the wiper with a rubber hammer. do not break your winsheild.