"Reg Edwards"
As Cecil says, a wider than expected bandwidth in an antenna of given
size, is an absolutely sure sign of greater loss somewhere in the
wideband antenna system.
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I don't know your definition of an "expected bandwidth," but for a reality
check--many forms of panel antennas used in FM and TV broadcast transmission
have 20% or better SWR bandwidth, and radiate nearly every watt that can be
delivered by the feedline with almost NO "matching" losses. They have been
in routine use for decades at master antenna transmit sites all over the
world.
RF
Visit
http://rfry.org for FM transmission system papers.