Taidacent DC Feed RF Bias Tee RF Microwave Bias Active Antenna RF Power Supply Mains DC-Blocker 10-6000MHz Amplifier DC Bias

This does a good job. I was skeptical of EVERYTHING China electric, but it has zero leakage on the output. A trimmed USB cable can be used for input while tucked inside a small project box.

Works perfectly. Needed something that shipped with Prime and this fit the bill. This is the same exact bias tee board you can find in all other marketplaces but without the wait. Successfully powered this via USB and also designed a little enclosure to help reduce EMI as noted by another reviewer.

The workmanship (soldering) on the unit I received was simply atrocious. I don’t have time to wait for a replacement, so I had to rework it. Give this one a pass.

The input is not quite sensitive enough for direct hookup to a car antenna. It would be best if this was the second stage of a ganged amplifier. However, the S/N ratio is good enough to do this - IF you feed it well filtered power, well isolated from the alternator.

Been using this for a few months with a minimum of 12V, but I am not sure if this really works. It power on, but I don't really notice a difference in reception. I don't have the tools to check this if it really does works. The version I have, seem clean and free from defects. I will continue to use it and see if anything changes and I will update.