Quote Originally Posted by abcd567 View Post
Also Applicable to Monopoles with Ground Plane, Length 1/2 of Length for Dipole
It should be noted that anything larger than 1/4w or 1/2w has funky impedance characteristics and will require a matching network. Without it, you'll lose any benefit you might get from increased power collection ability, if not actually do much worse than a plain 1/4w or 1/2w.

Colinears are (or so I understand) a different story because they're made up of 1/2w elements put end-to-end in opposing phase. Though I don't think I've ever seen anyone put a colinear on a VNA to test that, commercially made colinears don't seem to bother with matching networks so I guess their impedance is comparable with that of coax.