At least the seller is truthful about his coil.
As soon as I saw the picture, the first thing that popped in my head was "inefficient", then while reading his description he says it isn't as efficient as larger coils, which is very true.
Then he goes on to say that it has "good gain" which is laymans terms for it's not entirely a dummy load, it does resonate.
That's the biggest drawback to mobile HF, you ARE going to be at a disadvantage no matter what you do, you just have to decide how much of a disadvantage that you want to have.
Large coils that clear the roofline are the most efficient, coupled with the longest whip that you can get away will work very well... as long as you take care of a few other details like bonding and not shorting out too much of the coil when you try to tune a lower band (higher freq).
I'm old school and would rather have a tuned antenna than a whip attached to a tuner.
Hamsticks and screwdrivers aren't for me, it's either Bugcatcher style or Hi-Q.
