The Par Electronics EF-SWL is an end-fed short wave antenna optimally designed for 1-30 MHz reception. It is a receive-only antenna I use here extensively at VE3CNU.
If you need a broadband shortwave listening antenna that’s better than the random wires I have always used in the past I recommend these. I have used a Par antenna before, the EF-20 for 20 meters, and am quite happy with it.
See the EHAM reviews of the EF-SWL.