Very nice, but I wonder how much that fishing pole section would cost?
Another idea...something that my ham radio club did (which they got the idea/plans online) was to use measuring tape for the elements. I'm not sure how much they weigh compared to the welding rods (probably more), but they are pretty light and coil up tightly when not used. The main beam was PVC though and that makes the whole thing a bit heavy.
One of these days, I might have to work on my own design using the measuring tape, some carbon fiber arrows, and some 3D printed parts to hold it all together.
Edit: I just looked and fishing rods (without reel) are a lot cheaper than I expected. I quickly found a 16 foot rod that is in 5 sections for only $24. That's probably cheaper than my idea of using arrow shafts.