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Full coverage fm broadcast antenna attic ceiling mount
Full Coverage FM Broadcast antenna attic ceiling mount
Here is the FM-FD1 Attic or ceiling antenna from Rescue Electronics
This antenna is designed to provide complete FM Band coverage 88 MHz to 108 MHz for those who cannot use an outdoor antenna but still want great FM reception.
Simple hang this antenna vertically ..or horizontally if desired from the attic rafters using a non conductive cordage (No Wire) and run a 75 Ohm coax cable to your receiver. Or attach it to the ceiling of a spare room as seen in the pictures below.
The antenna is constructed from 1" square aluminum tubing and high strength polycarbonate insulators, and all stainless steel hardware.
The 300 Ohm to 75 Ohm matching balun is included with the antenna.
Lets review some 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 actual measurement of the SWR in a real world environment using test equipment.
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