Based on 275 reviews
very useful, but be careful to find a 'perfect spot' to place it. It's recommend to have a antenna cable extension, if you want to check many places
Gain at the amplifier below 1. for comparison, the first photo is connected antenna and amplifier, the second photo is only an antenna, the third photo is an ordinary slingshot antenna, the fourth is Later I'll take out the "amplifier" look what there is in general. Forgot to download. Added a photo of the inside of the amplifier. Soldering wires is terrible. The circuit is on one transistor.