I’ve been contemplating doing a CB whip for 40 meter CW portable, but wasn’t sure if it would have enough juice to warrant attaching it to my RAV4. I’d want to play with it at home first and see how it does. I also considered taking the same whip and mounting it horizontally on the luggage rack to get that ~1/10th wavelength ground effect (even though it would be more like 1/20th or so).