onelinkmore BNC Male Plug to 2X 4mm Dual Banana Female Jack Socket Binding Post RF Coax Coaxial Splitter Connector BNC Banana Adapter for HF Radio Antennas Oscilloscope DVM Pack of 2

I've found these have multiple uses in ham radio, especially with QRP setups and antenna experimentation. They seem to be of decent quality, and I haven't broken one yet.

It is a good product

With this some feed line and some speaker wire you can make a quick mobile ham radio dipole antenna on the cheap. Works well and is extremely easy to use. Run the red side to the driven element and the black side to ground and attach radials and it can be used for a fishing pole vertical mobile in place of a 1-1 balun

These fit pretty well but the fit is not super precise, and the adapter is rather long allowing cables to apply leverage.

Works well

Nice for measuring DC voltage off a BNC connector on outdoor microwave radios.

If you have an oscilloscope or signal/function/waveform generator, or similar equipment, you need these for really short probe wires to minimize LCR, or connect multimeter probes for anything that doesn’t need proper compensated and balanced oscilloscope probes. And if you have a radio with a BNC antenna connector then this works for makeshift wire antennas and connecting up baluns and feed lines that aren’t coax.These seem pretty solid. Have both axial and transverse banana plug holes, and the usual screw type binding posts with plastic encased metal nuts and a little (transverse, that is cross drilled) hole in the posts to help hold the wire while screwing it down. They are NOT the crappy binding posts with purely plastic nuts.Also seem solid in general. These are the lowest price I found at the time for reasonable quality (but always check prices because on Amazon especially they change constantly).I got 5 even though two would do at the moment because I always end up needing more of a particular adapter than I initially think I will need.

I use these to make dipole antennas for both at home and field day or POTA use. You will need an adaptor from BNC to UHF so you can attach your cable to you radio of choice. I guess you could just us cable with BNC connectors but I don't do that myself. Attach this to a portable mast of some kind and raise you dipole up and you are on the air. Youtube has videos on using these for antenna builds. You could even use these to build a vertical antenna with radial system to suspend from trees. Imagination and the hobby and you have a great connection point for your coax.