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To gain the advantages of the End Fed Half Wave (EFHW) antenna the antenna must be a resonant half wave or multiple there of and fed with a 49:1 or similar. The End Fed Half Wave (EFHW) antenna has about 2,500 ohms impedance at the feed point. If you are using some other matching device such as a 9:1 transformer what you have is a "random" end fed antenna. The random length End Fed antenna usually requires an earth, counterpoise and tuner. The performance of the random length End Fed is dependant on the ground, counterpoise and efficient tuner. But it can and will tune up on almost any frequency.
The End Fed Half Wave when correctly configured does not require a ground system, counterpoise, or tuner to work efficiently on the frequencies it is a half wave or multiple thereof.
Your antron A99 is a prime example of such an antenna.
Getting the correct wire length for the EFHW is critical. It must be a half wave or multiple there of for the frequency you want to use. It actually works out a bit less than the free space calculation for a half wave.

<blockquote data-quote="magnuman" data-source="post: 766841" data-attributes="member: 12583">To gain the advantages of the End Fed Half Wave (EFHW) antenna the antenna must be a resonant half wave or multiple there of and fed with a 49:1 or similar. The End Fed Half Wave (EFHW) antenna has about 2,500 ohms impedance at the feed point. If you are using some other matching device such as a 9:1 transformer what you have is a &quot;random&quot; end fed antenna. The random length End Fed antenna usually requires an earth, counterpoise and tuner. The performance of the random length End Fed is dependant on the ground, counterpoise and efficient tuner. But it can and will tune up on almost any frequency.The End Fed Half Wave when correctly configured does not require a ground system, counterpoise, or tuner to work efficiently on the frequencies it is a half wave or multiple thereof.Your antron A99 is a prime example of such an antenna.Getting the correct wire length for the EFHW is critical. It must be a half wave or multiple there of for the frequency you want to use. It actually works out a bit less than the free space calculation for a half wave.</blockquote>

[QUOTE="magnuman, post: 766841, member: 12583"] To gain the advantages of the End Fed Half Wave (EFHW) antenna the antenna must be a resonant half wave or multiple there of and fed with a 49:1 or similar. The End Fed Half Wave (EFHW) antenna has about 2,500 ohms impedance at the feed point. If you are using some other matching device such as a 9:1 transformer what you have is a "random" end fed antenna. The random length End Fed antenna usually requires an earth, counterpoise and tuner. The performance of the random length End Fed is dependant on the ground, counterpoise and efficient tuner. But it can and will tune up on almost any frequency. The End Fed Half Wave when correctly configured does not require a ground system, counterpoise, or tuner to work efficiently on the frequencies it is a half wave or multiple thereof. Your antron A99 is a prime example of such an antenna. Getting the correct wire length for the EFHW is critical. It must be a half wave or multiple there of for the frequency you want to use. It actually works out a bit less than the free space calculation for a half wave. [/QUOTE]

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