There appears to only be 3 wires, blue with red stripe, black & what looks like white with poss a black stripe, will check again tomorrow. But there is no plug as it appears to have been cut then put into a connector block (with little screws fixes)
I have an electirc aerial that I removed from my Mk1 Eunos donor that has a connector with 4 wires from the white box at the side of the motor, Blue with white stripe, Green with white stripe, blue with brown stripe & black with yellow stripe.
The motor has 3 wires going to a connector omn the bottom of that white plastic box, they are; white, yellow & brown
If you are anything like myself, and you know next to nothing about car electrics I would suggest that you take your car to a car electrician, they will sort it out for you in ten minutes or less. I have always found these guys very good.
As you probably saw from my first post, the loom wires you have are correct. The car has been played around with over the years and an aftermarket electric aerial fitted at some time. The original plug would have been cut off and the connector allowed for the aftermarket aerial to be connected.
In your position I recommend soldering on an original plug and fit the correct arial.
I have the plug with atub wiring to solder on and sell refurbished MK2 aerials - Private message me if interested.