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your dipole is a balanced antenna, whereas the A99 or I max are seriously unbalanced, which in turn can cause coaxial radiation which is highly undesireable and can cause rfi all over the place, things might not have been so bad if they had actually supplied counterpoises with those antennas rather than try to rip more money out of people.

rfi isn't always relative to signal strength (i've seen many cases where a tweaked cb caused havoc but a standard one or ham rig running 100w did nothing), can be caused by dirty weaker signals or even in the case of the A99 etc from coaxial radiation close to the appliance suffering rfi, poor design of both the radio or interfered with appliance is another very common cause of rfi. even a corroded contact can act as a rectifier and rectify rf in an appliance or even cause rfi to the radio.