“I have no idea what an ICF dipole is.”
The poster wrote “OCF” which means Off-Center Fed. It is an antenna where the feed line connects at some point that not the center of the overall length. The more commonly used antenna is called a dipole because it has two legs of equal length for use in a specific frequency range. The dipole is frequency-specific while the OCF is more frequency-agile when used with an antenna tuner. All of this is only important for transmitting purposes & not critical for the receive-only you want to do. Any good length of wire will allow reception. The other stuff can come with time as you learn more about the details.
You can just strip the end off your coax hang it in a tree or out your window
It’s lenght has to be right for the frequency for 2 meter band just off the top of my head, I think is trimmed to 19 inches.
You can do this for any frequency until you start getting into giga hrz.
Cool, thanks.