If your attic dipole presents generally reasonable swr50 values on the bands of interest it is less important to keep the tuner at the feedpoint and one in the shack becomes more accpetable.
Attic dipole safety.
You should attempt to maintain symmetry in the system by bending the ends of the antenna in equal amounts.
If the attic area is not large enough to accommodate an almost full size dipole simply erect as much of the antenna as possible in a straight line then bend the ends of the dipole up down or sideways from the main portion of the system.
This was installed at a previous qth i will be the first or millionth remember i m from fl to affirm that the antenna is the determining factor for success when it comes to one s station set up.
I have just over 40 feet available along the peak of the attic and would like to cover 10 40 meters.
However a good 1 1 current balun should be used at the feedpoint in either case.
For the most common type of antenna the dipole the high voltage point is the ends of the antenna.
Power output won t be over 100 watts and i m aware of rfi potential and have done some rf exposure calculations.
Luckily his attic and the shake shingle covered roof are entirely made of wood with no metal objects to contend with anywhere.
There are numerous online rf exposure calculators that can help you accomplish this important task.
There can be sources of interference in the attic.
If your attic dipole presents generally reasonable swr50 values on the bands of interest it is less important to keep the tuner at the feedpoint and one in the shack becomes more accpetable.
The infamous attic dipole.
Mac af4ps fp 51 note.
The radiation patterns could cause some health risks and interference that you would need to work to resolve.
Out of necessity i will be using a multiband dipole in the attic for hf.
However a good 1 1 current balun should be used at the feedpoint in either case.
The testing isn t hard but it is conducted so that operators have the basic safety and knowledge to make contact.
See diagram of 40m ocf along roof ridge line.
It is not in the signal path.
Keep away from sources of interference.
Finally as attic antennas may be physically closer to us don t forget to make an rf safety evaluation to ensure your family and nearby neighbors are properly protected especially if you re living in a townhouse or condominium.
Antennas in the attic are a fire hazard this is one of my most favorite excuses because the factual case of a fire hazard is nearly impossible to make.
Even wiring can carry interference from elsewhere in the house so try to keep the antenna as far away from this as possible.
All told a friendly environment for an indoor swl antenna.
Ensure that the signal is not required to pass through this i e.
His shortwave receiver is a yaesu frg 8800.
