Topband: superdirectivity

[Sam Dellit]

g'day earl and the topband gang

thanks for taking the time to reply

i am slowly taking on board tom's assertion that
ultimately the s/n on topband is determined by the
directivity of the antenna. it is a largely sound concept
which will probably never find its way into the textbooks
on antenna theory because it has relevance only to the
dx community. i should mention that my main interest 
is mf broadcast dx, but there is a large area of common
interest to both groups, particularly when it comes to 
receive antennas. i am looking for a broadband antenna
with a beamwidth better than a 4 wavelength beverage
and a little less demanding on real estate, especially something
portable which can be constructed on the beach.  the array
of pennants (i am more inclined towards flags which can use
their support structure as part of the antenna) has considerable 
merit, a broadband cardioid must be a great building block for
any superdirective array, but i can't see why an array of verticals
can't be equally effective. the search continues .........

73s gd dx de

sam dellit  vk4zss





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