It seems to me that a simple dipole would work fine or an inverted V. All
the fire stations I know of already have a tower of some kind to place the
feed point.
All you would need is about 66' of wire off each side slopeing toward the
ground at the ends (to make it more omnidirectional )
Black stealth wire comes to mind. The wireman sells it online (just google
thewireman) It is very hard to see.
Or you could buy a pre-made dipole for 75 / 80 meters.

My 2 cents.

Joe