The short one is "Aerial Base No.9, Mounting No.1" and general use. The taller one is Mounting No.2 and was for installations where there was a lot of "clutter" on the turret (or other mounting point) that the antenna needed to be clear of. There's also a "Mounting No.3" that is very tall indeed (about 2' 6" IIRC) and has a rubber (US/Canadian) or coil spring (Australian) base.
I got a No.2 in a Pershing tank install kit (not that that is any help to you as they never went into British service - trials only, then the war in Europe ended).
Chris.
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