Jack, that American M10 aerial looks suspiciously like a High Frequency item from their extensive line of signals equipment. They did not make much use of the 19-Set, so an installation point for a B-Set aerial on their M10's would likely be irrelevant to the crew. The B-Set was for inter vehicular communication between tank crews at VERY close range. For a Commonwealth M10 crew, it would probably not take too long for them to realize with open turrets, it was likely far easier to yell or hand signal intensions to adjacent crews.
As for the turret traverse causing aerial damage from the gun barrel, that also may not have been a serious problem. the M10 turret, if I recall correctly, was manual traverse only with a 360 degree travel rate on the order of 80 to 90 seconds. Pretty slow.
I think the M10. both 3-inch and 17-pounder, also had longstanding issues with either gun being too heavy for the turret and several attempts at counterbalancing were made throughout the service life of the M10. If the vehicle was traversing a slope, there was serious risk the turret stops could fail and the weight of the barrel suddenly swing the turret to face the low side of the vehicle. Not good for crew moral.
David
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