This is the simplest type of antenna, a half
There are no directors and a reflector - it
is a bi-directional VHF radio aerial, with its
gain lobes coming towards the camera and
This relatively modern design utilises a
dipole that has been bent into a circle to
maximise its directional capabilities.
I imagine the dipole's been folded because
bending it into a circle alters it impedance,
and folding corrects it.
You don't see many of these around any more!
This is a VHF TV aerial for 405-line
This picture was taken in 2000, 15 years
after VHF TV transmissions ceased in the
Notice that the director separation changes
as you move down the boom - this is to increase
the bandwidth of the aerial.
Tony Currie: "The part to the right (Dipole
+ directors) is for Band III. The part to the
left (the X) is the Band I aerial which is a
dipole with reflector at 90 degrees.
"These pairs were very common in the late
50s and throughout the 60s. In the earler 50s
it was more common to use an H aerial for Band
1 - a straight dipole + reflector. Many aerial
manufacturers produced aerials which physically
combined the Band I and Band III elements
together. The output of each aerial was then
fed into a combiner (often just taped to the
mast) and thence to a single piece of
If you look closely you can see two pieces
of coax, one from the 'X' and one from the
The large aerial here is a VHF radio
antenna. It has an unfolded dipole and a
A vertically polarised UHF TV aerial is
Here's a circular folded dipole VHF radio
aerial, and underneath a UHF TV antenna.
All of the vertically polarised (ie the
antenna elements are vertical) UHF aerials on
this page are group A aerials, which have a
bandwidth which covers channels 21-34.
If you look closely you can see that the
directors are gradually becoming shorter as
they get further from the dipole. This is to
increase the bandwidth.
The reflector is of the plate type.
Here's a close-up of a vertically polarised
UHF TV aerial. It has a plate-type reflector,
tubular directors and a plate-type folded
The blob attached to the dipole is a plastic
weatherproof box which contains the connections
between the aerial and the feeder cable.
Signal strength is greatly reduced if water
gets into the co-ax.
Here's a back view of a UHF TV aerial. Here
you can see the clamp used to hold the antenna
onto its mounting.
The feeder cable is taped to the
|In this weather-beaten example
you can see how the directors become shorter the
further away the get from the dipole.
Here's a shiny new vertically polarised UHF
TV aerial (with an unusually designed
reflector) and a horizontally polarised
high-gain UHF TV aerial with 18 elements as
opposed to the usual 10 or 12 in strong signal
The low-gain antenna is receiving pictures
from the Fenton relay whilst the high-gain one
is pointing towards the Sutton Coldfield main
This hapless creature spent an evening
bashing against the side of my parents' house
during a storm.
I believe it's a wideband model (i.e. covers
all UHF channels from 21-68) as the separation
between the directors changes markedly from one
end of the boom to the other.
Which means that we we ripped off, as it
should have been a group C/D aerial for
receiving pictures from Winter Hill.
||Here's a close-up of the folded
dipole and rather crumpled reflector.
Here's and 18-element horizontally-polarised
aerial (also pointing towards Winter Hill) and
a low-gain vertically polarised antenna, both
with unusual reflectors.
This type of reflector design appears to
have been popular in the 1970s.
||Here's some medium gain aerials,
probably 14 element, pointing towards Sutton
For one last picture, here's the Fenton
relay in Stoke-on-Trent, where all of the
vertically polarised aerials on this page were
Click here for
more on the Fenton relay.