Not necessarily - notice the relatively flat SWR (less than 2:1) over a
large frequency range (for 160 meters). That normally means that the
antenna is acting more like a resistance than a radiator.
I would expect the SWR on 160 meters to be low only over a 25kHz or at
most 50kHz range of the band.
When the SWR bandwidth of an antenna increases, you should be looking
for a problem in that feedline, antenna to feedline connections or in
the case of a vertical, the ground radial system.
One possibility is that the radial wires installed were aluminum - they
do not last very long in the ground, for some reason, moles like to chew
on them.
73,
Don W3FPR
On 12/3/2018 9:18 AM, Don Roberts via Elecraft wrote:
Lee, it looks like your inverted L wire has stretched. Check with an antenna
analyzer and you will probably see your resonate frequency is lower than 1.8
Mhz. Perhaps time to do some triming.
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