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LIkely that radio would be a little bigger than the size of an ordinary shortwave radio. Possibly a double conversion superhetrodyne. The police would have had such radio sets mounted in their police cars, probably most of the set in the trunk, and a small control head on the dashboard. Maybe they used VHF FM radios, sinilar size. American police and fire depts used General Electric "Progress Line" FM transcievers back in the 1950's. These radios used about 20 tubes, and were about 40cm by 30cm by 10cm big.
The antennas would be small enough to mount on a vehicle.
A radio that could intercept local transmissions would be essentially the same as an AM radio or an FM radio.
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