In reply to GW0DSP:
Well, Mike, I did say that 3 dB is “improbably inefficient”, my point being that a huge loss of half the power would still only be a half S point, which is hardly perceptable, a more realistic loss of, say, 1 dB is only going to be felt at the psychological level, isn’t it?
Another point comes into play which I omitted to mention before. Say you have a doublet which is a half wave at 40 metres. With the aid of the ATU it will resonate on 20 m as a pair of end-fed dipoles, it will be a colinear with about 3 dB gain over a dipole, so if you orientate your antenna broadside to middle Eu you have effectively doubled your power in that direction - and to North America, too, although you probably won’t get any benefit from that! On 10m the antenna becomes a four half wave colinear with about 6 dB gain but the radiation pattern breaks up with four sharp nulls.
Whilst you are correct that a doublet working below its resonance is less efficient than a dipole, efficiency calculations show that the difference is small until the size difference becomes quite large.
On the face of it the five older bands look like plenty, but if there is an obtrusive contest it is nice to be able to retreat to the WARC bands, where in any case the DX is more friendly!
Arguing about the weight brings to mind some of my fellow enthusiasts when the Backpackers Club was formed in, was it 1973? - they were so weight conscious that they even cut the handles off their toothbrushes! My approach was to carry what you needed and if necessary increase your fitness level to cope with it! I have a long way to go to recover the fitness that I had a couple of decades ago (but it WILL come!) but even so I do not feel the <500 grammes of my Z match and patch lead, and I do not need to leave the rig and mess with the antenna to change bands which either reduces the time an activation takes or increases the number of possible contacts in a set time…and coax is rather heavy!
As you say, its horses for courses, I am not saying one way is better than the other, I am just pointing out that both ways have their benefits.