High of the operation antenna is also good question when there is no trees.. later we may discuss that . Vertical wires in vertical fishing rods are the usual. After that the rf power and matching the radio.
RF POWER
While I'm in the field. Some time. I need more rf power to have wider distance contacts.
Sometimes I use a handmade HF amplifier with pp 2 Χ MRF 454 Motorola gives 200w PEP SSB . 160 CW
Some times i use a commercial Amplifier SPOKEN with modification with 2X 2SC2879
SPOKEN TYPE 250
MAY GIVE PEP 250w SSB / 200 CW