Wide Band 300 Ohm Folded Dipole FM Band
Covers the entire FM Band 88Mhz to 108Mhz
Ceiling or Attic Antenna  FM-FD1
Rescue Electronics Surplus
FM-FD1 FM
Omni Antenna
Some Antenna Facts
  • A simple balanced wire dipole antenna has a limited bandwidth which is not adequate for covering the
    entire FM Band. See the plot below and note the very high SWR at anywhere beside the resonant point
    of the antenna. Dipole bandwidth is a function of frequency, diameter, material and the antenna's
    environment.
  • A folded dipole, made from a larger diameter, has an impedance of 300 Ohms (so it requires a balun),
    but also has a much greater bandwidth. See the plot below and note the SWR stays well below 2 to 1 for
    the entire FM band.
  • The very last plot is a picture of the SWR  in a real world environment using test equipment.
Manufactured by
Paul A Cianciolo  W1VLF
Email PaulC@snet.net with inquiries
Price $99.00 plus shipping
Built of 1" square aluminum tubing with polycarbonate insulators the FM-FD1 is designed to
be hung from the ceiling of a room or from the rafters in the attic.  This is perfect for the FM
enthusiast that cannot locate an antenna on the roof.
The FM-FD1 design of 1" aluminum yields a rugged, high performance antenna that weighs in
at just under 4 lbs and is 54" tall.  Not shown in the picture is another set of insulators that
allow for mounting in the horizontal and orientating toward your favorite stations.
Keeping the feed line at 90 degree angle to the FM-FD1 antenna helps insure the most omni
directional pattern.  With that in mind, the FM-FD1 has a support to keep the feed line heading
in the correct direction.
Antenna Plots
Computer calculated and real world testing.