It is better to get the center higher as the signal radiates closer to the center of the V rather than the ends of the wire. You need to be 90 - 110 degrees to be considered a V but you lose a little gain in that config - so a perfect T at 30 - 35 feet is the ideal... above 35 feet it could become directional then a V would be better.
I am 24 feet up with the same setup and the issue I have found is that my signals are far stronger in the direction opposite the side of the house (south)... I hear nothing north and east (hear very little - once in a while europe) and west I cant get further out then Minnesota... all on 20 Meter (forget 40 meter - I get about the same but with more noise).
I the lack of height coupled with it against my house is causing some issues with the pattern... When the 20M is wide open I have hit Kuwait and Croacia... so I know I am radiating but it could be better.
Here is what I am doing...
I am putting up on the side of my house at the peak and just below, side antenna mounts, reinforced from behind.... Mount a 10 foot pole on that to get the antenna ABOVE my roof line plus using a 5 foot aluminum pipe bolted to the mast OUT perpendicular 5 feet from the house
That would get me roughly 30 - 34 feet, 10 feet above my house, 5 feet away from my house.... I suspect this will take a OK antenna and make it a great antenna (for 10 - 20M)... and greatly improve my 40M
My current setup I have contacts to Croacia, Czech Republic, England, but I can ALWAYS hear/make contacts to south america - that means my signal is good just not radiating in the other directions.
The net net - height and getting it away from objects would be your best bet... dont worry about getting the ends up as unless your at least 1/2 wave in the air its omni directional anyway - you need to be considerate most of what is possible reflecting/blocking the signal --- your house with the radiant barrier (which I have) is a great reflector...
The other option is to make it a slanter... you will get forward gain in the direction of the bottom of the antenna (not feed point)..
I'm moving my current homebrew dipole from one side of my house to another. For the ends, I will be using 16' poles with small pulleys as my attachment point for the tether cords. The question is about mounting the center. I know a local painter who will probably let me use his ladder to attach the center at the roof line of my second story. This will of course cause some slope on the dipole, but will also keep the ends a little above 16' (approx 20'?) high since they won't extend all the way to the end poles. The other option is to mount the center at 16' so the dipole is flat. Is it better to mount the center as high as possible, or compromise on this height in order to keep the dipole flat?
73.. Mike, KD7QLU