Root on A string
x-10-11-10-11-x
Gm7♭5 is the G half-diminished chord. Its notes are G, B♭, D♭ and F. Also written ø7. Often the ii chord in a minor ii–V–i progression.
x-10-11-10-11-x
Numbers show frets from the low E string to the high e string; x means don't play that string.
Gm7♭5 is the viiø7 chord in A♭ major. That makes it a natural fit in songs written in those keys.
Every G, B♭, D♭ and F on the first 12 frets. The filled dots are the root, G. Build your own shape from any nearby group.
Other G chords
Other half-diminished chords