That sort of construction can be made much easier by using the 'Array' tool in the 'Tools' menu. If you've never used it before then a quick few trial/practice runs should set you straight, it's quite easy and saves a lot of time and effort. Also, make sure that the construction of the various parts is of the absolute minimum amount of polys that you can get away with. For example, those multiple black coloured antenna elements in your screen cap, they seem to be of circular cross section, can you get away with making them 4, 5 or 6 sided ? The red coloured vertical poles, are they round ? make them square sectioned to reduce the polycount. At the end of the day, who is gonna argue with you that the real ones are not square, besides, many antenna manufacturers make the same objects differently. That's a design philosophy I've always used, albeit sparingly.
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