High-quality gold-plated adapters; 50Ω impedance. 

This is a great adapter to connect SMA antennas to any RTL-SDR with a female MCX connector, like the NESDR Mini 2, NESDR Mini 2+, and the NESDR Nano series.  Generic DVB-T dongles and SDRs also generally utilize MCX connectors as well.  

We recommend using adapters instead of cables, where possible, as losses are always lower than with adapter cables.  Of course, some installations require cables due to physical limitations.  We carry adapter cables in our store as well, if you need one, take a look!