 |
 |
|
|
 |
 |
 |
 |
G0MTN mini-antenna farm:
Force 12 C3SS tri-band yagi @ 9m
Carolina Windom C160S @ 8m
Butternut HF6V @ 0m
132 ft inverted L for 160m @ 8m
1/2 size G5RV for SO2R @ 8m
 |
 |
|
6 elements on an 11 foot boom |
Linear loaded 14 MHz elements |
 |
 |
 |
The antenna is mounted on a modified version of
the standard 10.5m 3 section Tennamast. The mast is 8.5 metres
at full height, and when retracted it is only 3.35 metres.
This enables the antenna to be invisible to neighbours when wound down - which was the reason I got planning permission in Green Belt land, in spite of several objections. The antenna height is about 0.5m above the mast height when the rotator and stub mast are added. The turning radius of the antenna is 13.5 feet.
Whilst the antenna will rotate in my garden, (just), when the mast is wound
down I cannot rotate the antenna as it will strike trees !
|
 |
 |
|
I use a Carolina Windom 160S (132 feet long) for the low bands (or all bands when the yagi is wound down) |
My other antenna is a Butternut HF6V.
It's ground mounted at the end of the garden, and has about 15 radials
attached.
|
 |
The far end the end of the garden has a 20 foot scaffold pole. As the dipole balun is quite heavy and makes the centre sag a little, during contests I use a fibreglass prop to push the centre to about 8 metres. |
| I have a Comet 144 / 432 MHz collinear mounted
right at the apex of the loft. This means it is higher than
I would be able to mount it outside, but I am right next to brickwork in
one direction, and nearer neighbour's TV antennas. Still, it seems
to work ok.
I put a half size G5RV on a fibreglass fishing pole, with the dipole centre right at the apex of the loft space. The ends still have to be bent around the loft, but it fits in. |
 |
The final antenna was put up in July 2003 - this is a 132 foot end fed in inverted L configuration. This is fed from the base of the mast, and driven against some radials (max length of radials around 50 feet.) I hope to improve the radials for the winter season. The problem is the garden width being only 28 feet. The inv-L goes up to the top of the mast, just below the rotator, and then along the garden.
I have a pair of lanyards at the house support end, and on the mast, so it's easy to pull up to full height when I need to use this antenna. The inv-L is only a temporary antenna - the final 20 feet or so are coiled up and hung on an apple tree when not in use. Fortunately it only takes a few minutes to attach the antenna to the house support and get it in the air.
