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BM,
I have tried and tested an A99 for receive and transmit at 36' to the bottom with and without ground plan radials and found that the radials changed the standing wave some an it was not as flat over the range of frequencies this antenna can cover without using a tuner. In AZ the soil is not good for good reflection for antenna radiation, like if it were on SF bay on a boat over water (Best) setup. A dipoles does good in this environment. I do have two inverted Vee antennas under my A99 and it does not seem to improve or detract for any or the three antennas to any degree, space is somewhat of a problem for me, but can load all antennas to 1000 watts but my 20-40-75 meter inverted Vee I built will still load to a 1000 watts but do have CMC that come back to the shack but still loads 1000 watts. Have a friend that has a beam antenna under his IMAX-2000 for use on 11 meters and it works up to 200 watts OK but above that there big SWR problems and thing break down quick because of to much antenna interaction. At my location I have never found a ground plan antenna that works better than the A99 at 36' to the bottom, the A99 handles the wind way better than most antenna I have tried, and does a good job with SKIP, Ground wave and does the bottom part of 10 all of 11 an 12 an 15 meters with the use on a tuner using 100' of RG9913U coax....................Oldtimer

<blockquote data-quote="walterb" data-source="post: 302119" data-attributes="member: 6966">BM,&nbsp;&nbsp; I have tried and tested an A99 for receive and transmit at 36&#039; to the bottom with and without ground plan radials and found that the radials changed the standing wave some an it was not as flat over the range of frequencies this antenna can cover without using a tuner. In AZ the soil is not good for good reflection for antenna radiation, like if it were on SF bay on a boat over water (Best) setup. A dipoles does good in this environment. I do have two inverted Vee antennas under my A99 and it does not seem to improve or detract for any or the three antennas to any degree, space is somewhat of a problem for me,&nbsp; but can load all antennas to 1000 watts but my 20-40-75 meter inverted Vee I built will still load to a 1000 watts but do have CMC that come back to the shack but still loads 1000 watts. Have a friend that has a beam antenna under his IMAX-2000 for use on 11 meters and it works up to 200 watts OK but above that there big SWR problems and thing break down quick because of to much antenna interaction. At my location I have never found a ground plan antenna that works better than the A99 at 36&#039; to the bottom, the A99 handles the wind way better than most antenna I have tried, and does a good job with SKIP, Ground wave and does the bottom part of 10 all of 11 an 12 an 15 meters with the use on a tuner using 100&#039; of RG9913U coax....................Oldtimer</blockquote>

[QUOTE="walterb, post: 302119, member: 6966"] BM, I have tried and tested an A99 for receive and transmit at 36' to the bottom with and without ground plan radials and found that the radials changed the standing wave some an it was not as flat over the range of frequencies this antenna can cover without using a tuner. In AZ the soil is not good for good reflection for antenna radiation, like if it were on SF bay on a boat over water (Best) setup. A dipoles does good in this environment. I do have two inverted Vee antennas under my A99 and it does not seem to improve or detract for any or the three antennas to any degree, space is somewhat of a problem for me, but can load all antennas to 1000 watts but my 20-40-75 meter inverted Vee I built will still load to a 1000 watts but do have CMC that come back to the shack but still loads 1000 watts. Have a friend that has a beam antenna under his IMAX-2000 for use on 11 meters and it works up to 200 watts OK but above that there big SWR problems and thing break down quick because of to much antenna interaction. At my location I have never found a ground plan antenna that works better than the A99 at 36' to the bottom, the A99 handles the wind way better than most antenna I have tried, and does a good job with SKIP, Ground wave and does the bottom part of 10 all of 11 an 12 an 15 meters with the use on a tuner using 100' of RG9913U coax....................Oldtimer [/QUOTE]

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