It all depends on what you want to do , is it for transmit , receive, or
both ?
First of all you need room, lots of it and if so what do you want, 1/2
wave, 1/4 wave or a full wave.

Assuming one wave , well on 160mtrs it would roughtly be over 400' long and
you
would need heavy cables for wires and two towers or phone poles.
There is no way to set up a diapole with trees, it will snap on a windy day.

Your best bet would be the G5RV ANTENNA
THE G5RV ANTENNA, with its special feeder arrangement, is a multiband
centre-fed antenna capable of very efficient operation on all hf bands from
3.5 to 28mhz, specifically designed with dimensions which allow it to be
installed in gardens which accommodate a reasonably-straight run of about
102ft (31.1m) for the "flat-top". However, because the most useful radiation
from a horizontal or inverted-V resonant antenna takes place from the center
two-thirds of its total length, up to one-sixth of this total length at each
end of the antenna may be dropped vertically, semi-vertically, or bent at
some convenient angle to the main body of the antenna without significant
loss of effective radiation efficiency. For installation in a very limited
space, the dimensions of both the "flat-top" and the matching section can be
divided be a factor of two to make the half-size G5RV, which is a very
efficient antenna from 7 to 28 mhz. The full-size G5RV will also function on
1.8mhz band if the station end of the feeder (either balanced or
coaxial-type) is strapped and fed by a suitable antenna tuner using a good
earth connection or a counterpoise wire. Similarly, the half-size version
may be used thus on 3.5 and 1.8 mhz bands.

**Beware that some antenna tuners cannot match this antenna !!**

Bob ,

73, VA2BIK