On our '87 190E 2.3 Becker radio (stock)

I have noticed that the antenna signal strenth indicator doesn't stay on long-distance after turning off the car. It is the little antenna in the right side of the radio read out ....

In order to get it to be most sensitive I have to push the button a couple of times. Is there a way to have it stay at one setting?

Thank you in advance-

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)