Found this information while looking at the Wilson Antenna site.
Vehicles with electric fuel pumps in gas tank
Although this is not aimed at any specific auto, primarily it is noticed with the Ford and Toyota autos, with the electric fuel pump located inside the gasoline tank. The symptoms are: a noise (generally a whine or whistle) is very noticeable on the radio when the ignition is first turned on, stopping after a few seconds. It returns when the auto is started and continues as long as the engine is running. The cure: install a pair of RF filters, one on each of the leads (positive and negative) coming out of the fuel pump. CAUTION: Be sure to check the vehicle maintenance manual to get the correct wires, and not the fuel level indicator wires. We have found the best available filter for this is the LM-20RF, from MTI, in Signal Hill, California, (800) 772-0796. They manufacture a wide array of filters to solve radio interference problems.
RollingRadios,
Remember the antenna problem with the lincoln.
2. Lincoln Continental, Mark VII, Mark VIII
This is a similar problem to the Taurus, however it only occurs when the trunk lid is fully closed and shut. With the trunk lid open slightly before closing and locking, the antenna will show good SWR readings. Shut the lid and let the electric lock take over and the SWR climbs. Each model has various cures and are handled in an individual case, however, the general solution is to ground the movable arm on the latch, and surrounding latch case or covering.
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