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No Most power antenna work the same. it takes two people to change them. watch and listen as radio is turn on then off do this several times then remove retainer nut turn radio on and assist removal of remaining mast watch where the teeth are located in motor assembly. fully extend new antenna mast lube with machine oil 3 and 1 works great then slowly feed new mast into motor assembly then turn radio off as you guide new mast down install retainer parts work antenna up and down overrun clutch will make the final adjustment.
Typically there are two ways: easy and major surgery.
The easy way is available, depending on exactly how the old mast is broken....Car off, radio off, unscrew the external pieces of the antenna at the mount, right where it exits the vehicle...Have assistant turn on radio and activate the antenna. It should spit the whole mast and inner piece. The new one goes in, BUT BE ready to carefully and without kinks, feed the new mast assembly.
If this method does not work, you have to extract the entire motor assembly and open it up. Sometimes easier to replace the assembly.
Mercedes preferred supplier of aerial masts is Hirschmann. There is a connector to the top of the box a coax aerial connection to the mast root, an earth lead strap and a bolted bracket to the base. The aerial mast exits through the car skin in a rubber fitted sleeve. You say that you can hear the motor running but that the mast refuses to emerge. The beauty of Hirschmann is that their motor drive antenna assemblies are readily disassembled (and reassembled). You will need to take the mast assembly out of the vehicle; disconnect the wiring plug socket, remove the bracket bolt, earth strap and unscrew the coax cable connector. Pull the mast firmly down and out of the body work sleeve.
The outer aerial mast is driven up by a toothed plastic flexible inner rod normally stored in a coil within the motor assembly. Remove the torx screw in the middle of the rounded end and separate the two halves. At the top is the electric motor set horizontally which drives a rubber belt to a helical drive immediately below it lying parallel.
If this belt is broken this would give rise to the motor running but not engaging . The helical drive engages with the edge of the storage drum feeding out and retrieving the coiled rod to raise and lower the antenna.
If the helical drive or the drum edge has missing teeth then the aerial cannot function.
All these components can be be bought from Hirschmann spares or through your Mercedes dealer.
Remove rear retaining screws of RH front wheel splash shield for access to antenna lower retaining bolt.
Remove lower retaining bolt.
Remove radio antenna nut (18865) from top of motor tube and remove electric antenna through fender/splash shield access.
Disconnect signal cable and motor wire connector(s).
To install, reverse Removal procedure.
Tighten top radio antenna nut to 6-8 Nm (54-70 lb-in).
Tighten lower electric antenna retaining bolt to 5.8-7.8 Nm (51-69 lb-in).
Check operation of electric antenna and radio chassis .
Automatic Electric Antenna
NOTE: A power antenna mast which is bent or broken can be replaced without replacing the motor and tube assembly. Removal
Remove radio antenna nut (18865) and radio antenna stanchion (18919) .
Loosen retaining nut inside tube using 14 mm (9/16 inch) socket, and slide nut part-way up mast.
Raise antenna to run plastic drive wire at bottom of mast out of motor. Note direction of teeth on plastic drive wire.
Saw off damaged portion of antenna mast. Remove burrs from mast and slide nut and contact tube off stationary tube.
With the teeth on the plastic drive wire facing toward motor on antenna, push end of plastic drive wire of replacement mast assembly down into tube. Push it around curve at bottom of tube until end enters drive mechanism.
Run motor down while pushing on plastic drive wire until about 305 mm (12 inch) of wire has been drawn into the tube. Stop motor and insert bottom of antenna mast into tube. Lower mast.
Slide contact tube and radio antenna nut down antenna mast. Tighten nut to 0.45 Nm (4 lb-in).
Raise and lower antenna several times to ensure proper operation.
Check the keep alive memory wire to the radio connector, there is a fuse, check it. there are 2 wires that have 12 volts one all the time even when the key is off, that keeps the radio stations and time, the other is the power lead, itis hot when the key is turned on. As far as the antenna goes I am not sure what you mean, does it work, the mast comes up?
If it makes a clicking sound when going up or if it is bent the aerial mast will need to be replaced, if there is no noise and it seams to work normally and just gets stuck then it needs cleaning. You can use wd40 and a cloth, with the aerial up, wipe upward (upward only, wiping down will push dirt into the mast and make it worse) spray the wd on the mast and the cloth and wipe upward, sent it down and repeat 2-3 times.
Len- The replacement only costs about $20. The dealer can also provide a replacement but it can cost upwards of $50+. Part number is 5035944.
The hardest part is removing the metal sleeve from the mast pole. Once you get this out, refit the new mast with the teeth so the motor will pull the new mast down when you turn the radio off. refit the 17mm nut on top of the mast and then turn the radio back on. It will click a few times and then be properly set.