Prior to the Telecommunications Act of 1996, HOAs could limit or prohibit installation of satellite dishes. Many communities still have these rules in their CC&Rs, but after October 1996, they are no longer enforceable. With a few exceptions, any homeowner may install a satellite dish of a size of one meter or smaller in diameter (larger dishes are protected in Alaska). While HOAs may encourage that dishes be placed as inconspicuously as possible, the dish must be allowed to be placed where it may receive a usable signal. Additionally, many HOAs have restrictive covenants preventing a homeowner from installing an OTA (over-the-air) rooftop antenna. These restrictions are also no longer enforceable, except in some instances. For example: the antenna may be installed at any location unless it imposes upon common property. Also, the antenna must be of a design to receive local, not long-distance signals and must not extend any higher than twelve feet above the top roof-line of the home, unless an exception is granted by the HOA due to extenuating terrestrial interference.