Bruce:<br><br>I thought the second .pdf had a formula for determining lengths but it may be confusing. If you want to adapt the first antenna to that frquency you can contact the ARRL lab at tis@arrl.org. Just reference the article and let them know what you are attempting to do. They are a real friendly bunch who love a challenge. <br> The advice from Mebrad about the software or contacting a local ham radio club is good too. There is a lot of hams who are pilots and they could probably whip one of these up for you without a problem from there own spare parts. You might even get into the hobby yourself.<br><br>Good Luck<br><br><br>Chris