I tried the counterpoise on my FT-5D for a while and then I tried without it. I was unable to perceive a performance improvement with the counterpoise. I tested by beaconing with the FT-5D both with and without the counterpoise and saw no difference in the places from which my signal was received.
That said, when I was desperate to contact someone for some assistance with a Geocache I had gone after, and realized after 2 hours of driving and an hour of hiking that I didn't have the coordinates, I stuck a fork under the belt-clip on my first HT (a Radio Shack HTX-420, which has a metal body) and was able to complete the contact that hadn't been working before I added the fork counterpoise. (I think it was the HTX-420. It might have been my Kenwood TH-F6)
I tried the counterpoise on my FT-5D for a while and then I tried without it. I was unable to perceive a performance improvement with the counterpoise. I tested by beaconing with the FT-5D both with and without the counterpoise and saw no difference in the places from which my signal was received.
That said, when I was desperate to contact someone for some assistance with a Geocache I had gone after, and realized after 2 hours of driving and an hour of hiking that I didn't have the coordinates, I stuck a fork under the belt-clip on my first HT (a Radio Shack HTX-420, which has a metal body) and was able to complete the contact that hadn't been working before I added the fork counterpoise. (I think it was the HTX-420. It might have been my Kenwood TH-F6)