How to Install an Antenna Mast on a 1977 Porsche 911S Using Pelican Parts

Replacing a broken or worn antenna mast on a 1977 Porsche 911S is a straightforward job that restores both function and appearance. The factory antenna design on these cars is prone to damage from car washes, vandalism, or simple age. Pelican Parts offers a direct replacement mast that matches the original specifications, making the installation process simple for any DIY owner. This guide walks you through the entire procedure, from gathering tools to testing the new mast, so you can get your radio reception back and keep your 911 looking correct.

Tools and Parts Needed

Before starting, gather the following items:

• Replacement antenna mast – Pelican Parts part number ANT-103 or equivalent for the 1977 911S (manual or power antenna depending on your car’s option). Confirm compatibility with your existing base.
• Flathead screwdriver – for prying off trim or bezels.
• Socket set – 10mm and 8mm sockets for removing the antenna base nut.
• Needle-nose pliers – to grip small clips or wires.
• Penetrating oil – like WD-40, in case bolts are rusted.
• Rags and electrical tape – for cleaning and securing wires.
• Multimeter or test light – optional but helpful for verifying power if you have a power antenna.

Pelican Parts typically includes installation instructions with their masts, but having the right tools on hand will save time.

Preparation: Removing the Old Antenna Mast

Accessing the Antenna Base

The antenna on a 1977 911S is located on the driver’s side front fender, near the windshield. To access the mounting nut underneath, you’ll need to remove the interior trim. Open the door and look behind the fender lining. You may need to remove a small access panel or simply reach behind the fender liner if it’s flexible. On some cars, the antenna base is secured by a nut from below, accessible from the wheel well. If your car has a power antenna, there will be a small electric motor unit attached to the base.

Before removing anything, disconnect the battery negative cable to avoid shorting any power antenna wires. Also, retract the antenna completely if it is a power unit – turn the radio off and press the power button if needed, or manually retract it.

Removing the Old Mast

1. Remove the antenna nut – Using a 10mm socket, loosen the nut that holds the antenna base to the fender. Hold the mast from above to keep it from spinning.
2. Disconnect wiring (if power antenna) – Unplug the motor connector. Note the orientation for reassembly.
3. Lift the base – Gently lift the antenna base up through the fender hole. You may need to push up from below.
4. Extract the old mast – The mast is usually retained by a small clip or screw near the base. On manual antennas, the mast simply unscrews or pulls out. On power antennas, you may need to remove a retaining nut or clip on the motor shaft. Consult your Pelican Parts instructions for exact details.
5. Clean the mounting area – Remove any old gasket material, dirt, or corrosion from the fender hole. This ensures a good seal for the new mast.

Installing the New Antenna Mast

Choosing the Right Mast from Pelican Parts

Pelican Parts offers both manual and power replacement masts for the 1977 911S. Verify your car’s equipment: if your original antenna has a motor under the fender, order the power antenna mast. If it was a simple whip that you pull up manually, get the manual type. The part numbers are distinct, and using the wrong one will not fit. If unsure, call Pelican Parts customer service with your VIN – they are helpful.

The quality of Pelican Parts’ masts matches OEM standards, with correct thread pitch, mast length, and mast-to-base fit. Avoid generic universal masts as they often require modification and look wrong.

Installation Steps

1. Install the new base gasket – If the new mast comes with a rubber gasket, place it over the fender hole.
2. Feed the cable – For a power antenna, thread the motor cable through the fender hole. For a manual antenna, just the mast base goes through.
3. Position the base – Lower the antenna assembly into the fender hole from above. Make sure the base is flush with the fender surface.
4. Secure the nut from below – Reach under the fender and tighten the mounting nut with a 10mm socket. Do not overtighten, as this can crack the fender paint or strip the nut. Snug it down until the base doesn’t wiggle.
5. Connect the wiring (if power antenna) – Plug the motor connector back in, ensuring the pins align correctly. Test the motor by momentarily connecting battery power to see if it extends/retracts before full reassembly.
6. Attach the mast – Most Pelican Parts masts have a threaded end that screws into the base. Turn it clockwise until snug. For power antennas, you may need to manually extend the mast slightly to align with the motor drive gear.
7. Test operation – Reconnect the battery. Turn the radio on and off to cycle the power antenna. It should go up and down smoothly. If it struggles, check for binding or adjust the mast slightly.

Testing and Final Adjustments

After installation, test radio reception. Tune to a known station and adjust the antenna length if needed (some masts have adjustable sections). Make sure the mast is fully extended for best reception. For power antennas, check that the mast retracts completely when the radio is off. If it stops partially, the mast may be slightly too long or the limit switch needs adjustment – but with a correct Pelican Parts mast, this is rarely an issue.

Inspect the fender area for any gap or loose trim. Replace any trim clips that broke during removal.

Common Mistakes to Avoid

• Using a manual mast on a power antenna base – The threading and engagement are different. Always match the type.
• Overtightening the mounting nut – Can dent the fender or break the base. Just snug is enough.
• Forgetting to disconnect the battery – Risk of shorting the power antenna motor circuit.
• Skipping the gasket – Leads to water leaks into the interior. Use a new gasket if yours is old.
• Not cleaning the mounting surface – Old sealant can cause poor fit and corrosion.

Final Recommendation: Why Pelican Parts Is a Reliable Source

Pelican Parts specializes in Porsche and BMW parts, and their antenna masts for the 1977 911S are engineered to replicate the original. They offer clear photos, part number cross-references, and technical support if you get stuck. While the installation is DIY-friendly, taking your time and following each step carefully ensures a professional result. After completing the job, you’ll have a fully functional antenna that looks factory-correct and provides strong radio reception. For owners who value quality and proper fit, Pelican Parts is a solid choice for replacement antenna masts.