I have an Icom 706Mk11G which was modified by HRO for expanded tx/rx over two years ago for use on the Navy MARS freqs which include 5mhz. The radio has performed just great with no problems. The removal of Diode 2030 is fairly easy using an exacto type knife. If you are in doubt of the location of the diode, e-mail me at firstname.lastname@example.org
and I will send you a picture of the diode to remove.