I used to run low band 2way Motorolas in my service trucks, 150 watts without a repeater gave me 30-40 miles depending on hills. Those puppies would dim the headlights at night when you keyed up.I sure did not realize they had that capability in the 1940's
The transmitter unit in the trunk was interesting and they mentioned a larger batterie and generator for the vehicle . It must have pulled the juice on a call .