You Can't See the Mast for the Tree

Q: When is a tree not a tree?
A: When it's a mobile phone mast.

Competition Time

Spot the mobile phone mast disguised as a tree for a chance to win a self-satisfied glow that comes with knowing that you are able to differentiate between a cleverly disguised mobile phone mast and a tree. Submit your answers on a postcard. The winner will be drawn from the correct entries.

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I'd never encountered this phenomenon until moving here, but apparently they can be found all over the US and Europe, including the UK.