I cannot comment about frequency limitations in other countries and for different licenses. Even less for the 40m band because the purpose of this post was to give some tips to NA activators wishing to be chased by EA hams on 20m, which is where we have good propagation conditions for that, as well as yagis capable to copy the weak signals from NA activators.
However, I’ll take advantage of this to mention that NA activators should avoid certain frequencies like:
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14.032, where there is QRO DX traffic and it’s very difficult to hear a QRP weak signal from a SOTA activator thousands of Km away.
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14.060, which is the QRP calling frequency and a NA activator on that frequency can be easily covered by any European QRP stations CQing or ragchewing on that frequency.
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14.224 to 14.239, which is dedicated to SSTV, as I recently explained in this thread: Tips for SOTA DX: 14.032 NOT good QRG and QRS better than QRQ
73,
Guru