thanks toll-free, i knew you were a sigma fan but i did not know you were keeping an eye on me lol,
not sure what type of slot antenna you relate the sigma style to, i dont know much about them at all but i am keen to learn,
i see it as a modified form of open sleeve antenna,
i agree it will beat a groundplane,
they will talk to and hear stations at distance that a 5/8wave mounted at the same height just cannot hear,
i agree the person installing the sigma style antenna will make or break the performance depending on what they believe is the correct way to install and tune those antennas,
they can be made better at distance by playing with the relative sleeve and radiator lengths then retuning,
i said it felt like i was actually manipulating the radiation angle to pick up 1.5 s-units over the stock antenna on the ft990 meter at 60+ miles,
sirio have now lengthened the radials by 16" and claim a lower radiation angle, is that the truth or is it marketing hype ( they do have an rf anechoic chamber to test models ) seems like somebody is listening,
i never went over about 91-92" but i now have the tubes to go longer if its needed,
thanks for the model it is very interesting,
how about modelling the sigma with 16" added to the radials, lets see if what sirio are claiming is backed up with your software,
i tried modelling the sigma but soon realised i needed to learn more about nec before i could do what i wanted so im back to field tests to see if i can improve on what i started with,
welcome to the "ITS NOT A J-POLE" club, your badge and teeshirt are in the mail
