Any antenna no matter how poor can work DX. I worked 3B9C on Rodrigues Island on 20m from my 100 watt mobile with a crappy Hamstick mobile antenna and it was long path at the time,15,000 miles on a crappy antenna. I have also worked into South Africa from my mobile on 10m and worked mobile to mobile into Luxor Egypt. Better antennas do help but saying it cannot be done without the right antenna is just plain false as there is NO "right" antenna.
How far can you get out at 12 watts through the hamstick on 10m?
What did 3B9C have for equipment, beam antenna and high power?
Isn't every piece of equipment important to the efficiency of the system, sometimes even the location of the system?
It is a mute point for the most part, the genie was let out of the bottle long ago, with the amps and export radios for CB to be a good short distance mode of communication full time.
Its like my dad used to say, wish in one hand and poop in the other- see which one gets full first.