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Paul,
ON-POINT: For your USB 11.175 MHz a Half Wave Dipole (HWD) is a good antenna but requires a specific length and height for a small band of frequencies and for those frequencies is very directional. * These facts limit the HWD's application as a good overall for the other group of frequencies 5-9 MHz (USB). * You could construct a Dual-Band HWD or Tri-Band HWD Antennas to try and cover these three SW bands. * Usually Multi-Band HWD Antennas are 'cut' for the lowest frequency (longest/largest size). * A type of HWD that uses a single center support with two slopping legs is call the Inverted "V". NOTE: The commercial antenna that goes by the Brand Name of "Alpha Delta" Model "DX Ultra" (80Ft Long / 20-30Ft Center / 5-10Ft Ends) is a Tri-Band Inverted "V" Antenna. http://www.google.com/search?hl=en&i...=Google+Search FWIW: You may wish to consider the a simple basic antenna that incorporates the Low Noise Antenna Design Concepts a la John Doty. http://groups.yahoo.com/group/SWL-AM...enna/message/2 The best shape antenna that lends itself to the Low Noise Antenna Design is the Inverted "L" Antenna. http://groups.yahoo.com/group/SWL-AM...nna/message/10 The Inverted "L" Antenna can be erected at any average Height 15-45 Feet and for any reasonable Length 30-135 Feet to fit your land and space limitations. When constructed well using a matching transformer and ground; they can give good omni-directional coverage across the LW, AM/MW, and SW Bands. ~ RHF .. .. = = = "Paul" = = = wrote in message ... Would an antenna like the one in the link be any good? I am looking for a decent shortwave antenna. I mainly listen to 11.175 USB and 5-9mhz USB. http://www.radioshack.com/product.as...Fid=278%2D1374 Any advice would be helpful. thanks, Paul |
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