One configuration Hams use for portable antennas is short, normally used as a mobile vertical, loaded dipoles end to end elevated horizontal. Pole mount adapters to screw the antennas into, with a SO239 connector, are available from many sources.
Here I have 2ea, 20 Meter RM-20 Hustler coils mounted on
4 of the almost 5 foot
surplus fiberglass masts we use in our Campo Fire / CERT Communications Trailer.
Click on graph for a larger version.
2 to 1 VSWR bandwidth is 144 kHz at 14.322 MHz, |Z|=32.5 Ohms, and 14.188, |Z|=88.5 Ohms.
Efficiency will naturally vary with antenna height and ground conductivity but that's another story.
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