[DX] FS: Brand New Tennadyne T3.20M 20m Monobander

[Bill Tippett]

N0JR wrote:
 > 3 driven elements optimally spaced at 9' on an 18' boom, gain in excess of
8dbd.

         Caveat emptor.  I don't believe Tennadyne's claim below of
8.5 dBd (or 10.6 dBi) for an 18' boom on 20 meters.  Like most
things in life there are no free lunches (or magic) in antennas.
Gain is a direct function of boom length.  According to NEC
models, you need boom length of about 40' to achieve >8 dBd (or
10.1 dBi) on 20m.  Claims like this are why ARRL doesn't accept
antenna advertising without specific reference to NEC modeling.
If Tennadyne is touting this sort of performance, I would be
highly suspicious of anything else they claim.  Remember the
Gotham vertical ads years ago?  Caveat emptor!

                                                 73,  Bill  W4ZV

http://www.tennadyne.com/new_models.htm