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I want to run some experiments to determine the effectiveness of various configurations of single wire antennas for my ancient Hallicrafters S-38C. I recently bought an RTL-SDR V3 with the optional small antenna kit. I get great FM reception, which proves that the dongle and antenna are working properly, but I have yet to have any luck with shortwave reception at night using it with my MLA-30+. I was thinking that taking advantage of the waterfall display would be a great way to find stations that my S-38 can pick up. The thought also occurred that the RTL would be a really handy tool for testing how different lengths and routing affect shortwave reception, giving an immediate and graphic representation of how that particular antenna is bringing in signals. I'm not particularly interested in going down the dipole antenna rabbit hole or messing with coaxial lead-ins, baluns, etc. So if I want to stick with single wire antennas in various forms, how can I connect them to the input on the RTL?