What the heck are these for?

[stubie_doo]

Anyone know what these are for?



I've noticed they seem to be popping up all over the place and they've just installed two massive ones near where I live. Some of them have huge junction boxes at the base too.

 

[stubie_doo]

Thought they might be mobile masts but the ones near me are only around 600m apart! Different providers perhaps?