I am on the 20th floor in downtown Toronto. I see the planes line up to land 24L/R and can see the tower from my place. When I aattach the external antenna with a ground plane (an old cookie sheet) it works great, but as I said when I take the scanner indoors, and leave antenna outside a big fat zero. Could be the unit. I also have the SONY 2010 and it works fine indoors with an outside antenna, but it is not a scanner so pick a frequency and switch manually. Let me know how your scanner works inside the building and inside the aircraft. Maybe it's time for a change...