I have not looked at a Radio for 40 years
On radios back in that time, had a hole on the side of the case, the hole was usually on the same side as antenna cable plugged into.
Inside of that hole was a small Phillip's screw
That screw could be adjusted to bring in the local FM stations.
I never turned the screw far & I counted the distance the screw was turned
If it did not increase the clarity going clock wise, then i returned go back to the factory setting & turned it clockwise.
If that did not improve the reception, it had to be returned to the factory setting.
Today, our radios are half Radio & half laptop computer