[TowerTalk] Antenna Modeling needed 160 vertical

[john at kk9a.com]

Why do you want to make it short and base load it?  The top loading wire are 
more efficient and if anything I would just put a hairpin coil at the base 
to match it to 50 ohms.

John KK9A

To: towertalk at contesting.com,topband at contesting.com
Subject: [TowerTalk] Antenna Modeling needed 160 vertical
From: Ed Stallman
Date: Sat, 29 Aug 2009 16:32:26 -0500

Hello Towertalkers

My plan is to construct a 160m vertical using 4 inch irrigation
tubing 90 ft tall, with 4 top loading wires spaced 90 degree and
sloping down at 45 degrees . My target freq is 1.830 but would like
to make the top-loading a bit short so that the antenna was resonant
about 2 MHz.  Then put a small (a few uH) loading coil at the base to
bring the antenna to resonance at the desired frequency.  I am
placing the antenna 300ft away from any other structure , hoping for
no interaction . I'll start with 32 ground radials and add more
later, not sure on the length ? 90ft or 130ft ?

two questions
how long will the top-loading wires be for resonant at about 2 MHz
using # 14 copper insulated wire?
how long should I make the ground radials ?

Thanks Ed N5DG