Get a PAR quad band resonant EFHW, it will make the Comet look like a dummy load. You can build a similar 40/20/15/10m EFHW for a few $$ and they rock the air waves. I traveled around the country with an Elecraft KX3 and a home brew 40-10 EFHW and most people didn't believe that I was running only 10 watts. I have a Maldol and some other brand tapped vertical similar to the Comet and have made some contacts on 20 and 17m but those antennas haven't been used in years in favor of the vastly superior end fed.
Sitting here working out the antenna lengths and counterpoises for use with a Comet HFJ-350. Doing lot's of SWR sweeps and clips with the dykes.