Sooner or later every ham has to answer the question, "Now that I have my antenna up and coax or ladder line up to the house, how do I get it inside?" In some cases drilling through the wall is a good option. Every case is a little different. This is how KI4ZMV solved the problem. After noticing how some hams placed a passthrough board horizontally between the window sash, Bill decided to turn this idea on its side and use it with his lanai's sliding doors. Works great! Plenty of room for expansion, and the best part, it is practically invisible from the inside.