four clamps 910 912 914 and 916 that form a pinned connection with the monopole 10 one difference to fig5 b is the design of clamps 910 912 914 and 916 which will now be described with reference to fig9 b fig9 b shows one of the four clamps 910 in more detail the clamp 910 comprises a horizontal arcuate clamp plate 932 that supports an downwardly extending bearing plate 934 for engaging the monopole 10 the connection between the clamp plate 932 and the bearing plate 934 is reinforced by reinforcement gussets 936 and 938 which are in this example arranged such that they are equally distanced from the centre of the clamp plate 932 and one end of the clamp plate 932 a third reinforcement gusset 939 is located at the centre of the clamp plate 932 at the centre of the clamp plate 932 there is a outwardly extending round bar 940 attached to the top surface of the clamp plate 932 the round bar 940 has a thread 942 at the outward end when in use the round bar 940 is received by clamp guide 920 in fig9 a and 9 c the clamp 910 further comprises two vertical coupling plates 942 and 944 located at opposed ends.