There is extensive digital operation in MARS, so interfacing with the computer is a consideration.
The Icom 7200 has a built in USB port, so you only need a USB cable to interface with the radio. No Rigblaster or other interface box is needed. The radio also has very good DSP capabilities, making weak signal work possible in many cases.
A good antenna tuner is a must, as you eill be operating on multiple frequencies, many times shifting 1 or more times in an hour net.
A multiband antenna is also a must. Research NVIS antennas, most are easy to homebrew wire antennas. an 80m OCF dipole works well. Long wires and non resonant dipoles fed with ladder line also work well.
You will have a communications system when you are set. Radio, tuner and antenna, and a computer set up for various soundcard digital modes.