Hi,

As a beginner in SWL I hope that somdebaody can give me some advice:

I have Yaesu FRG-100 which I want to set up primarily for HF Airband
monitoring so I need to install an antenna.

From what I have already read a longwire is the solution, but some
references refer to connecting the wire directly to the receiver and others
talk about a Balun. Since my receiver has two antenna connections (1 hi
impedance and 1 low impedance) I assume that if I connect just the wire I
connect it to the high impedance but if I use a Balun I can connect to the
low impedance. But what If I do not use a Balun and connect to an ATU
instead , the output from it is PL259 coax connector do I just connect this
to the low impedance input or to the high impedance one. Or do I connect the
balun close to the antenna and use a coax feed between it and the ATU low
impedance input.

To get the required length if I was to run the antenna in my attic is it
reasonable to loop it around the attic several times or should it be a
single loop.

When calculating the required length I assume that full wave is preferable
but if its not possible then it should be calculated to be 1/2 or 1/4 is
that a correct assumption. Is there any drawback in having it shorter than
fullwave ?

Should the antenna wire be insulated or non-insulated type ?

Any help would be appreciated on the above.
regards
Birderman