There aren't any. They don't really work and they are all mono-directional with a short diameter / radius.
directional
is address bus uni or Bi-directional
omni-directional is the opposite of directional. A directional antenna receives or sends more signal from or to the front than the sides or back.
Some are directional like the eagle F1, however most are not directional.
last time my teacher just said their mono. Buddhism is the one that's poly.
precision directional drilling sub contractor rc directional
In my world, mono means one.
Mono is like single or alone, so it's mono mono, all my life I'll be mono, I'm alone and it's good to me, mono, from love I run away, mono... That's the chorus atleast
The s orbital is non directional.
There are no directional integers. Perhaps you are thinking of vectors.
Directional