A:Answer With the ClearStream 4MAX, it does not require power. Some outdoor installations, based on where you are located and the signal strength coming from the towers, a preamplifier might be needed. Once you have your antenna installed and if you are not receiving all the available channels in your area - you can see all the available channels in your area https://www.antennasdirect.com/transmitter-locator.html - if you need assistance, we have a great team of tech support available 7 days a week. You can call us toll-free 877-825-5572.