Some 6 dB hybrid couplers:

A hybrid combiner from junkbox parts

A homemade hybrid coupler/combiner built several years ago and recently characterized.

A classic hybrid combiner design

Wideband hybrid coupler, similar to the classic ARRL Handook design.

The impedance bridge of the N2PK VNA

Measurements of the hybrid coupler used as impedance bridge for the N2PK VNA.