are not compatible with Sonoma Instrument amplifiers and are likely to damage them. Please read this document to familiarize yourself with the problem and prevent damage to your... amplifier. (Download this document in Adobe PDF format) An active antenna consists of an antenna element and a battery powered built-in amplifier. Theoretically, there should be no need... for an additional external amplifier, but in practice many users prefer some additional gain. Sonoma Instrument amplifiers are low noise, high gain devices designed to handle very...