I removed the End Fed antenna after 11 years of loyal service. Today I installed the Sandpiper MV 6+3. I also replaced all coax cables. I once had a Sandpiper MV 5+3 with good results.
In fact, it outperformed the long wire. This can be found in an old blog post. I can work from 80m to 6m including the WARC bands.
At 80 meters, the bandwidth is narrow as expected. Only 50KHz. I chose the QRP CW portion of the band and FT8. I rarely do SSB.
The SWR on 80 meters is 1:1.5 and on all other bands the SWR is 1:1 I did a test run on 80 meters FT8 with 10 watts output and I am quite satisfied. See the results below.
It's still a compromise antenna but good enough for me. If you have limited antenna space, this is an ideal antenna. The antenna does not have to be placed high either. 18 inches off the ground is good.eHam.net too.