A resonant ( proper length ) antenna would work best, even for RX. One could use a random wire, but if you are able to use at least a 45’ wire with a 9:1 balun you may enjoy the results.
One part where AI is lacking, or conforming/twisting the answer to suit your needs is about the short length of wire. Yes, it will reduce RFI, but it also reduces the signals you want to monitor on 80 meters.The AI result notes it will lower AM broadcast interference, which is true, but it will reduce the signals you want. The one thing not mentioned is the use of an AM broadcast filter. One can then enjoy a target band like 80 meters and let the filter reduce the AM broadcast RFI. ( RFI = Radio Frequency Interference ). Also, a choke balun on the coax before it enters your home may help. I am fine without one at that spot, but others see improvement. An RF choke on the coax at the antenna feedpoint is what helps me the most.
* Always remember that AI is working to give you the result you want, but it may never be the best result.
I recommend you experiment.