Is the Icom M72 a VHF/UHF model? I have an old Drake TR-7 modified to transmit and receive from 0- 30 mghz. On the boat I have an Icom 701 marine SSB which is programmed to transmit 1.5 to 27 mghz so this unit is good for both Marine SSB and Ham bands- works well with its auto tuner and back stay antenna.
Sorry to say, I'm not sure of the exact frequencies I can transmit and receive on. Marine SSB specifically (I've not needed it). You can look into it though, Google, "Yaesu FT270 hard mod" and see what comes up or Google the product. I do know it's opened up all channels I use for off-roading, sailing, weather etc. The unit has become very versatile.