I found this fascinating quote today:
I have read about rain gutter and downspout antennas but never tried loading my own or worked somebody using one, until earlier this week when I had a QSO with Craig, KA1GYB. During our 80m PSK31 chat Craig told me he was using a downspout antenna and had worked 42 countries and 42 states, including Alaska, from his Connecticut QTH with that antenna. His signal gave great copy for me and I was very impressed. He told me he could load it on 160m to 6m, using an antenna tuner.va3stl blog about Downspout Antenna
You should read the whole article.
As a condo dweller with antenna restrictions, this approach has appeal. Do you have experience with doing this? Our downspouts are connected to plastic piping leading to an underground drain. I assume if they are wet, it might be a tall dummy load.
Pipe in on this if you have some thoughts.