If your radio is prone to images from strong signals, an antenna tuner will help. I had a single conversion solid state comm receiver that was prone to images below the SW broadcast bands.
I homebuilt an antenna tuner out of a couple AM radio tuner capacitors and a coil of copper wire wrapped around a large plastic spice bottle, put it between the long wire and the radio. It got rid of the images.
I've used a very similar circuit for listening to random wires for years, Boombox. (And at times with an E5 to boot, CM.) It does well once you figure out how to tune and tweak the thing for the best sig to noise ratio. I use a large pill bottle for the coil form, with about 20 turns of 22 gauge mag wire tapped every 5 turns.
I've got MFJ transmitting ATU for random wires I picked up for 5 bucks at a hamfest. I like it for listening, it will tune up about any hunk of wire. If I can figure out what box of radio junk it's in, I'll post the model number. I know they still make version of it.