I have the DX Engineering DV-40-P, and it exceeds my expectations. Unfortunately, the DV-80-P is not going to pan out.
Why? I just found out that it is critical that you have even and equal radials between the two, and that they all be on ground. You cannot have one really good radial field for one and not so good on the other.
I was able to tune each vertical and even get each at 39 ohms. At the Tee in the middle, in the “both” mode, the SWR was ace. But in the shack, and on the air, only the single vertical and both positions worked. The vertical on the deck didn’t do what it was supposed to – show some directionality and also a good SWR.