Martin, DK7ZB describes a horizontal, almost omnidirectional, 2m VHF antenna. Its leightweight enough to mount it to a fiber mast.
Its rather easy to build and fast to mount.
I used 4mm brass tube for the horizontal elements and 1mm antenna wire for the vertical elements. Therefore the resonance isa bit too high but this should not be a too big problem.
The pictures show the antenna on my 10m fibre mast mounted at the balcony and the S11 measurement data (calibrated to the input of a 15m Aircel7 cable).

Quadlong for 2m

Quadlong VHF reflection measurement