One more quick question, as RS doesn't seem to have shipped the antenna to their store yet:
After some research, I found that my fear was accurate. Once unfolded, it's "impossible" (to quote someone I read) to "re-fold" the elements without damaging the antenna.
So: Can I test the antenna without completely unfolding the elements? If not, is there an acceptable alternative to the HBU-22 you could recommend that might not have this design?
Sorry to keep bugging you, but that's what can happen when you're so generous and responsive.