40m Attic Dipole

The design has been tested and simulations performed to verify that efficiency can be maintained for such a small antenna.

40m attic dipole. It gave me 40 20 and 15 with a push because although a 40 meter dipole should give you a resonant 15 meter antenna in this case with the coils for 40 it mucked the maths up and caused the atu some trouble. 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. 1 point 1 month ago. I live in an apartment and so have been pushed into operating portable.

You should attempt to maintain symmetry in the system by bending the ends of the antenna in equal amounts. Generally small enough to fit indoors in an attic. See diagram of 40m ocf along roof ridge line. A fan dipole with wires cut to resonate on each of the required bands but trap loaded on the lf bands and a zigzag end loaded dipole.

An auto tuner in the attic can work but you need a lot of counterpoise and there can also be a lot of problems to overcome. Mac af4ps fp 51 note. 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. The 40 meter dipole was loaded with some coils so that i could fit it in the attic.

A coaxial cable trap dipole antenna installed in the attic provides a surprisingly effective solution to hf operation on the 10 15 20 30 40 and 80 meter amateur bands at a qth with restrictive covenants that prohibit outside antennas. The better your antenna the more success you will have making contacts. At this stage i. A 40m dipole in an attic is going to have a hard time getting out beyond a couple hundred miles unless you are sending slow code.

On 40m it worked a treat. Loft attic antennas for restricted spaces. The free space gain at 40 m is estimated at 0 3 dbi and at 20 m at 0 05 dbi with 1 76 dbi being the theoretical maximum for a short dipole. The infamous attic dipole.