Original article from: Wayne Sarosi 
 Reposted by Rob Dennis,Moderator HAM_TECH,for use of the FIDO HAM_TECH echo.
  THIS POST/SERIES NOT TO BE USED IN ANY CDROM COMPILATIONS FOR COMMERCIAL
 SALE WITHOUT EXPRESS WRITTEN PERMISSION OF ORIGINAL AUTHOR(S) OF THIS POST.
               ALL AND ANY COPYRIGHTS RETAINED BY AUTHOR(S).
SUBJECT:  Tape Antennas - part II
          o  Tape antennas on sun-film windows
          o  Tape antennas on screened windows
Tape antennas on sun-film windows:
 Using the tape loop,discussed earlier,I tested the antenna on two types of
sun-film windows. The first was a plastic film, often used in states such as
Florida. There was no significant pattern or gain change for the antenna.
 The second type of film is the metal film sun screen.
 Results here were dramatic.
 The pattern was severely disrupted as well as SWR.
 Be sure that your window films are not the metalic type if you plan to use
indoor VHF/UHF antennas pointed out the window. The metalic film acts like a
reflector to the signal.
 Attenuation is a strong factor concerning propagation.
 Some plastic films appear metalic, but may not be.
Tape antennas on screened windows:
 There are a three types of screen used as screening for windows.
 Plastic,fiber,and metal. The first two show some attenuation of the gain and
pattern shape is similarly effected. Basically,the addition of the screen
frame effect the VHF spectrum greater than the UHF spectrum.
 The screen frame size is near the size of VHF loops at frequency.
 Metal screen acts similar to metalic film with greater effect. Using the top
portion of the window is the best bet unless you don't have windows like the
type used in the Northern States.
---------------------------------------------------------
 Here in Florida,I have single windows that slide to the side rather than the
older storm type in Connecticut. The film on the windows is plastic.
 Testing was conducted here at my QTH and at the Electromagnetic Laboratory,
KSC,FL.
-WS
--- GoldED 2.42.G1219
---------------