Technical comment to the attention of some negative comments:
An antenna amplifier does not improve a signal (especially the signal to noise ratio), it amplifies it (as the name suggests :-) and allows in some cases to prevent its degradation.
Examples:
1: If A tv working properly on a wall outlet, but the problems start when one more branch with one or more "T", the receiver will usually help. Indeed, the signal is correct to the wall outlet, it is the multiple connections that degrade the signal. The amp compensates for this degradation.
2: If you have ANY TV into a wall outlet and that the signal is bad (without amplifier), an amp on the wall outlet is not likely to improve the situation. The degradation may come from the length of the cable between the antenna and the wall outlet, then you must put the amp as close to the antenna (Provided of course that the antenna and cable are of sufficient quality, and the issuer is not too far from home).
Conversely, if the amplification is too high, the signal can saturate the receiver and degrade the quality! So do not set the gain too much.
In my case, a gain setting minimum or just above works fine, adjustment up or a little less generates reception problems.
