The loop style antenna guards resemble those used on the house style 2K1 body on 15 cwt chassis.
I don't know enough about the wireless installation on the HUW to be sure about how many antennas were on the roof but I agree with Bob that it looks like there is a similar hoop on the right side of the roof with personal kit stuffed between the pair of loops (as shown in other photos) that would be blocking the antenna location. Is it possible that not all installations used antennas on both left and right sides of the vehicle?
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