I have posted this in Flightaware in Feb 2016
Later, these were either posted by me on eham (as user ABCD567), or someone else has posted my images. Can you please provide the link to the eham post from where you got it?
Cutting whips to 67-15 = 52 mm improves to some extent but not much. I dont generally tell people 52 mm, as they start asking why 52, and to avoid giving explaination every time, I generally say 67 mm. In fact the whips in the two photos I have posted above are 52 mm for 1090 and 60 mm for 978
Episode 2 of Improving DVB-T Magmount Antenna.
NOTE:
In above post, images 2, 3, & 4 were knocked down during conversion of forum format to Discource. As I cannot edit old posts, I cannot fix it. I am therefore re-posting these here.
Images 2, 3 & 4
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