The Preamp is spoken for. K4TO I have an extra 144 Mhz mast mounted preamp that I don’t need. It is a Landwehr. It measures 0.45 dB noise figure and 21 dB gain. It has a built in RF sense and also means PTT if you have a sequencer. In the RF sense mode it is good for 150 watts. I don’t know how much if you sequence it. The inside is clean. I did repair a circuit board trace with a short piece of wire. It has no mounting bracket, but there are two threaded holes in the back of the diecast enclosure, which should be a simple mount to a plate with a U-bolt. The threads are more than likely metric. I also have the instruction sheet that came with it. It has a small schematic. $160 shipped to the lower 48. Dave, K4TO