From what I've been able to find out, that antenna is 7.66 feet long/tall. That's just about a foot shorter than a standard 1/4 wave on the
CB band/11 meters. I honestly can't guess if it would withstand an input of 3 or 4
Kw, but I tend to doubt it. I would think that it should perform very close to any other 1/4 wave antenna. How 'close' is another one of those "I have no idea" things. Would it be worth buy another antenna for make that comparison? Not to me, but our pockets are probably of different 'sizes' too. Ruling out the power handling capabilities, if you've got one, use it. If this '4000' antenna is longer than what you are using now by any great degree, 30% maybe, it will probably outperform whatever you have now.
All of that is just a guess. Take it for what it's worth.
- 'Doc