Obviously doesnt help with the loss but i would suggest getting long cables and feed them through a small window, i have an Eagle3 power unit on the mount and only have to feed the power cable to it , and a 25 foot HDMI cable given to me free from an accomadating neighbour who turns his light of when i text him to say i am imaging , i cant say how great is that we are friendly with the neighbours. One side is a plummer known them for 30 plus years and he installed our stand alone shower 20 years ago and wouldnt take anything for doing it just costs ,eventually forced a bottle of wine on him , the other side is an electrician so couldnt have worked out better!.
Roger