Three  examples of the G-P Spreadsheet are included here showing the data entered for the examples
in the QEX article (Sept/Oct 2007). These are only examples are no conclusions are to be drawn from
these models. Model your antennas in your situation and make your own assumptions. These models use
the MiniNec ground model which essentially neglects near-field ground losses. This will only give 
accurate vertical results if >120 ground radials are in place. The full version of EZNEC will be 
required to completely model a vertical antenna with that many radials.

If you do not have Microsoft Excel, you may download a free Excel reader from the MS website. This
will not allow you to manipulate data however.

The *.txt files are the direct outputs from EZNEC using the "FF TAB" button. Only the TOTAL field 
column is used for the G-P data. This field cannot be easily copied so this is imported into 
the .xls files using the "import data"  function of Excel. This is so you may easily paste the
data field from EZNEC into the appropriate G-P field.

The far right hand columns of the G-P SS include the data for Chicago, Illinois to various parts of 
world. Paste in the data for your QTH (your *.PRN files) here for easy reference. This will not 
automatically load.

Selection of antenna 1 or antenna 2 is completely arbitrary. Just remember which is which.

The graph shows "Gain of Antenna 1 over Antenna 2". If positive, antenna 1 is better. If negative,
antenna 2 is better.

Make sure you enter the data for the correct path (e.g. Chicago to Asia) and band that matches the
EZNEC calculations. Paths for your QTH are found in the ARRL Antenna Book bundled with the HFTA program
Search for the *.PRN files on the included CD.

Instructions:

Model both antennas to be compared in EZNEC
Output the TOTAL field data using the FF TAB button in EZNEC and save in separate *.txt files
Import the TOTAL filed data into EXCEL using the IMPORT DATA function
Copy the TOTAL filed column for antenna 1 and paste into Antenna 1 column
Repeat for antenna 2
Insert the data for the path of interest and band of interest into the G-P SS
Output is graphed automatically

Anyone interested in improving this method of calculation (e.g., writing a simple program so that 
EXCEL is not needed), please contact the author. If appropriate, it will be posted on K9SO.NET

Improvements in this technique are solicited and general comments or corrections may be posted at 
http://www.k9so.net