Rob ;
Yes , that base model antenna is missing a dome shaped chrome cover .
Are you still enjoying the car ? .
I love my '82 240D W/ slushbox tranny, I tour America in it and get 32 ~ 34 MPG's @ 60 ~ 65 MPH . the travel speed affects the fuel economy greatly : over 65 MPH it drops off quickly .
Sorry you lost your Dad , glad yo hear you had a good relationship with him, I'm jealous
.
As a (damn) Yankee born and bred , I beg you to never , _EVER drive this car in the snow nor spring until after the second really hard rain .
Salt takes a while to wash off the tarmac .