Over the years I've had a continuing interest in vertical antennas and the many small details of how they work. Most of the time the minutia are not of great practical importance but for those of us interested in more than casual explanations they can be very interesting. Here is a two part QEX article on just such a detail, how the radiation resistance (Rr) and the equivalent ground loss resistance (Rg) behave as the antenna dimensions and soil characteristics are varied: Download QEX Jul-Aug 2015 Download QEX sept-oct 2015 . As mentioned in a earlier post, I can't put all the supporting details in a single article, it would become unreadable so I've put the supporting material into a series of appendices which you can pick through if you're interested:
Download Rr Study Appendix A
Download Rr Study Appendix B v2
Download Rr Study Appendix C rev 1
Download Rr Study Appendix D