I have tried the device with and without the amplifier. Without an amplifier I get 20 channels - most of them with no signal or with a very weak signal, to the point of pixelation. With the amp I get 51 channels - most with no signal and others so pixelated that it's impossible to watch them with the signal going in and out. I did a test to see where the radio towers are reachable for my area. They are both within range of the device with or without an amplifier. As the saying goes, "You get what you pay for". Not a fan of this product.
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