For me QRP was never religion. It was convenient as transistors (or MOSFETs)
to do 5W were easy to get, higher power not so much. So many of my radios
were built with/as 1-5W radios. That said I have amps for ALL of them to get to
40/100/200W range depending on band and needs. I also have nominal 100W
radios in the mix as well. I use what I feel like using at the moment and no
regrets on the power chosen.
That said... I've put more of my time into antennas and good feed lines
because whatever the power, I plan to deliver it all. There is no harm, foul,
or rule saying that QRP requires a crappy antenna. I had a lot of fun on 20
and 10M using a few watts SSB into a Mosley TA33jr. Got me a lot of people
saying I was lying about the power. There is no difference between radiating
25W ERP from a crappy antenna using a 100W radio and 25W ERP from a 4W
radio and a tribander. Actually there is as the tribander made it easier to
hear in that direction as well.
Last year the club did field day as QRP and alternate power and for the HF
antenna we had 40m and 20M 2 element wire beams and a TH3 tribander
all about the same height. Everyone wanted to use the tribander! Likely
as not if the club goes QRP or 100W I can bet I'll be asked to bring the beam.
Short or compromised antennas often have a place but they all have the
same problem. They are inefficient or have gain below that of a dipole.
If site or situation means that is the best possible do it as well as you can.
To that VE7CA wrote a few articles on simple to make 2 element triband wire
antennas.. (QST November 2001). If you can get 45 foot wide space and
maybe 25-30ft up this will be an improvement over a simple dipole.
I cheat, I use gain at the antenna as none of the contests even talk about
antennas. Ok, there is one exception I know of where the antennas must
not be made of the usual materials! Lookup the K0S Strange Antenna Challenge,
Note they don't care about power used.