[Chas]

FWIR the early Ford antenna connectors pre-date the later "Motorola" style (that look like RCA). What is important is maintaining the shield integrity from the chassis at the antenna to the chassis of the radio. Most cables for auto radio are of the low capacity type. The internal conductor is a fine, copper plated steel wire in a hollow insulated tubing."common" coax has far too much capacity for such purpose. Though it will work but very poorly as it will be impossible to match the antenna to the radio with the radio antenna adjustment.

May have to go to an auto specialty restoration parts company for a cable assembly. It appears there may be a missing connector nut... chas