The different locations may very well be dependent on what radio was offered.  I know in '67, the antenna mounting location depended on what was ordered.  A front antenna was standard on (1) Pushbutton radio [RPO U63], (2) Pushbutton radio w/rear seat speaker [RPO U63/U80] and a rear antenna (manually operated) had to be ordered separately [RPO U73].  With the AM-FM Pushbutton [RPO U69] with or without rear speaker, only a front antenna was available.  The rear antenna was not available on wagons or anything with AM-FM radio.
 
Quite possible that the same (or similar) was true of the '64 model year.
 

Dale McIntosh
ACES #1709/TC #92 Gold
67 SS/67 Elky
http://www.dalesplace.com
http://www.team67.com
http://www.midwestchevelles.com

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