Check first the connection of the radio to the antenna... there is a cable that should go to the back of the radio. See if the cable insulation (the rubber like covering) has openings or the connection is loose before checking any of the devices that may boost the signal.
The usual cause of this is a defective antenna or antenna ground, if it is a power antenna verify a good ground, if ok replace the antenna, also check the coax connector to the back of the radio.
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