I'm not sure, but a ratio of 9:1 and the long wire antenna would indicate a unun which is used for impedance matching a random long wire to a 50 Ohms antenna input. One of the wire terminals is for the long wire and the other one is ground (same as the SMA's ground, the antenna's ground isn't used usually). For a dipole you would need a 4:1 balun.
Its just inside the box who got shipped with because I never get run it.
Now I want play around with <30mhz Stuff. I have just that thing with an Upconverter (who work with my CB Antena) and an LNA.
now the weather get better and i could put and sdr temporary outside the house.
For what are the 2 Clamp things are there and what should i put into them?!