I was online and I saw this link for using a tree as a receiver... I know it is a bit outdated (1919) but if it works... I think I will use one... here is the link http://rexresearch.com/squier/squier.htm
Trees (not tree's may act as a antennas, not as receivers, and that's not very surprising. Any conductive structure can be (ab)used as an antenna, be it your lawn chair, your braces or - if you want - a tree. Of course, the conductivity of wood is rather low, so you'll achieve a rather poor performance.
I came accross several other publications about this in the past, mostly from the dawning era of radio communication, but today noone would even think about using a tree in a real communication system, except as an antenna support. For LW/HF radio reception nowadays you're doing fine with a physically small ferrite rod antenna, something that was probably not available back in the days, also transmitter powers were probably lower. And so on.
Lest anyone think that General Squier is a crackpot, please read his bio and credentials. He is the inventor of multiplexing, the man primarily responsible for introducing radio to the Signal Corps, not to mention the first passenger on an airplane. He has a whole list of patents too.