Introducing the Birdog Version 4 USB PLUS Bird Dog Satellite Signal Locator Meter Perfect Vision. This top-of-the-line sat TV signal finder is designed to help you receive the best possible signal for your TV. With its advanced technology and easy-to-use interface, you can easily scan for available signals and determine which one is perfect for your viewing needs. This signal finder is made by Birdog, a trusted brand in the industry. It has one input and one output, making it easy to connect to your TV.