In ideal free space, both arms of a tuned wire dipole will be of identical length.
However, the real world is not perfectly symmetric free space. The support heights, ground levels, ground conductivity, parasitic buildings, wiring, feed lines, and metal towers might be close to one end and far from the other end of a dipole.
Given very visible differences (such as the above) between the environments at the two ends of a dipole, should each arm of a "center-fed" wire dipole still be equal in length? Or should the length of each half or arm be separately tuned (for lowest SWR, resonance at the desired frequency, etc.)?
If so, how?