Hi my uncle is using the Rf Systems GMDSS on his Icom-R75 excellent results on hf at dads place i use the Rf Systems DX-One Pro MK11 & Rf Systems DX-10 both do an excellent job across hf mainly monitor aero,utilities at my radio shack at home i use the Wellbrook active loops ALA1530,ALA1530L, ALA330S they also do an excellent job advantage is with the loops put them on a rotator and the performance gets even better these antennas are not cheap but they all do an excellent job on hf.
Regards Lino.
ALINCO DJ-X11,ALINCO DJ-X2000,ALINCO DX-R8
AOR-7030,AOR-8200MK3
GRE-PSR400,GRE-PSR500
GRUNDIG SATELLIT-750
ICOM-PCR1000,ICOM-PCR1500,ICOM-PCR2500,ICOM-R3,ICOM-R20,ICOM-R75,ICOM-R7100
ICOM-R8500,ICOM-R71A,ICOM-RX7
JRC NRD-545
KENWOOD-R600,KENWOOD TS-480SAT
PALSTAR-R30A
REALISTIC-PRO2035
TEN TEC-320D
UNIDEN-245,UNIDEN-396,UNIDEN-780
YAESU-VR500,YAESU-VX7R