It's not impossible that even 50-100 mW into a single feed multiband
antenna (i.e. a multiband yagi that's efficient and has gain also on
the harmonic related band) are enough to be heard thousands kilometers
away if conditions on that band are good.
Really strange, instead, if this happens with sophisticated setups,
expecially witha a MM station.
A MM station infact, because confined in a small area, can't accept to
radiate any strong signal in another harmonically (or not) band unless
seriously disturbing that band or even damaging receivers.
Typical MM arrangements are quite sophisticated and include absorbing
stubs and monobanders on each transmitting setup.
Those extra devices introduce an extra filtering effect of some 40-60
dB to the inherent attenuation of the amplifier with a PI (or PI-L).
73,
Mauri I4JMY
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