Just curious what all the naysayers would recommend for a portable antenna of similar size?
I think it's important to note that im a naysayer for two reasons. I'm cheap and I like to build stuff. I don't mind spending money on quality parts or things I can't build but in this case I feel I can do better for less money.
I think the mfj collapsible whip is a good idea. I would probably go with something like that or a used 5/8 wave cb ground plane. Utilize the insulator on the antenna or make one for the 17 foor whip. Then wind a big coil to shunt feed the thing and maybe add a variable capacitor. The plan may change depending on what band or bands a person is interested in using.
If there is a way to hang a horizontal dipole I'd build a dioole, feed it with ladder line (probably home made) and use a balanced tuner (also home made). The parts can be small enough to all fit in a backpack if this is a QRP setup.