The AURSINC Zeenko ZK04-UM LNA Amplifier is a good option for adding more strength and clarity to your signals in SDR, nanoVNA and the TinySA Ultra Spectrum Analyzer. This preamp is USB-C powered and is also available in various frequency ranges and gain values. The AURSINC Zeenko models are as follows: ZK04-UM LNA [100kHz-4GHz / 18dB gain], ZK05-UM LNA [100kHz-6GHz / 23dB gain@2GHz], ZK06-UM LNA [10MHz-6GHz / 21dB gain] and ZK09-UM LNA [100kHz-10GHz / 21dB gain]. Please note: these preamps are very small, so do handle with care.

If you want something a bit bigger and more robust, take a look at the Zeenko AURSINC ZK06-BM Low Noise Amplifier [pictured below]. USB-C powered, and also has a built-in battery. Frequency range is 10MHz-6GHz with an approximate 20dB gain. Good to use with SDR and TinySA Ultra 5.8GHz. It has a dedicated on / off switch on the side.

Power tests seem accurate and customer reviews are very good. Others worth looking out for that are popular are Nooelec Lana WB and the RTL-SDR.com LNA Low Noise Amplifier [Bias Tee Powered]. Frequency range is from 50MHz to 4GHz. Reportedly good gain, good build quality and excellent performance overall. Great for use with SDR, and just perfect for RTL-SDR’s dongle range.