Die-Hard CW Fans may find that the 807-xx resonates too high in the 80m band when using the standard RMU (RMU-R1).
The "RMU-CW" is finally available, but if you don't have one yet, here is a tip that may interest the CW-only users.
(Yes, it's just a piece of wire.)
Here is what its SWR curve typically looks like:
For Comparison: The 807-HD with Standard RMU (RMU-R1):
Comments: If you think the lower SWR will improve your signal in the CW portion of the band, you are kidding yourself. The 'On-The-Air' performance of the antenna is exactly the same, regardless of whether you are using the RMU-R1 or the RMU-0. Just use a good efficient matchbox if needed. However, if you absolutely want lower SWR for the bottom end of the band, and do not yet have the RMU-CW, use the RMU-0. (DJ0IP)