On Jul 4, 10:44 pm, N9NEO wrote:
Does anybody know which antenna I am talking about?

It fits inside a 8" x 1.25" piece of pvc pipe and half of the pc board
is the antenna. It uses a U310 fet and some bipolar following that.
Maybe a 2N5809. Stick it on a non-magnetic pole and the 12v supply is
in the house. I am looking for the link to it. A friend and I are
building them, but I left the documentation at my other QTH. If you
have any experience with it then I would like to hear what you think.

I'm also building the AMRAD active antenna, but the high dollar fets
aren't here yet.

regards,
NEO

I think you are talking about one of Dallas Lankford's active
antennas.
http://www.kongsfjord.no/
Look under "The Dallas Files"

He has several different designs.

I think the one you are wanting is in the "Low Noise Active Antenna AC/
DC Power Supplies"
pdf.

Unless you have a world class receiver, the difference between the
simpler antenna
that uses affordable JFETs and the other will be minimal.

I would suggest you give serious though to building the dipole
version.

Much better IMD characteristics.

Terry