I've experimented with a thin walled fiberglass mast in a heavy duty speaker tripod mount for a temporary setup. There is an AL-800 dual band telescoping antenna on the top. The top tubing section was a bit thin so I removed. As it is now I get the antenna up about 20 feet when mounted on the tripod. If its a bit windy a few 6 inch tent stake spikes with some nylon cord works to guy the mast so it doesn't blow over.
https://www.dxengineering.com/parts/mfj-1911
The antenna seems to match up OK on the GMRS channels when the coax is attached. No ground plane is needed thus reducing the wind load.
https://www.dxengineering.com/parts/pry-al-800
The mast pops out of the tripod and will collapse to about 4 feet. The tripod folds up to about the same dimension. Without any guy wires I can setup the whole thing in about 10 minutes.
I ran RG-58 cable up to the antenna. While a bit high on losses it is light weight and I'm not running the cable far anyway. I made the trade off with higher losses to get a light weight easy to setup and transport portable antenna system. If I have to I can use a 30 to 40 watt FM only amp that needs 4 to 5 watts drive power from an HT while drawing maybe at most 6 to 7 amps DC current, low enough to supply from a modest sized 12 volt battery.
For Ham use a Mirage dual band BD-35 amps works. For GMRS a wide band amp is necessary. One from BTECH will work, however it is not Part 95 certified.
https://www.dxengineering.com/parts/mir-bd-35
https://www.miklor.com/COM/Review_DMR-Amps.php
https://baofengtech.com/product/amp-u25d/
If you look around you can find good deals on the above used. I picked up a BD-35 and a U25D for $100 total at a recent Ham Radio flea Market.