hey mate, i do this everyday.
depending on the length - id still recommend using a TP Link antenna with 9bd gain - i have one at home 740sq block and i got 5 bar from front of house to back fence.
http://www.austin.net.au/ProductList...A/Default.aspx
options of going higher as well - just dont stand in front of it - ull eventually fry your nuts.
the POE will work but your right it needs to be on the same phase - circuit. wireless is easier to setup and no cabling. point and go - you can always put another antenna on the pc end as well point to point.