The feed line is lmr400.
Improve swr metal roof.
To alleviate this keep at least the top 12 inches of the antenna above the roof line and position the antenna as high as possible on the vehicle.
The sheet product itself runs about 1 00 sf.
Also try the indoor antenna by the windows.
Swr or standing wave ratio is a measurement of antenna efficiency.
While the swr measures 1 1 1 5 at the antenna it has always been higher at the radio.
What type of secondary water resistant barrier is my wind mitigation report referring to.
A 36 width roof underlayment install with ring shank nails having a minimum 20 rings per inch a minimum head diameter of 3 8 thru 1 5 8 tin caps or ring shank metal cap nails having a 1 diameter and long enough to penetrate the deck per code.
When we got a lot of snow recently the swr went to 8 10 or higher.
Not an expert but the metal roof should block the signal.
If the antenna and feedline are not working at peak efficiency some of.
What s directly beneath the horizontal antenna may impact nvis which is pretty much a 10 mhz and below propagation method and the metal roof might actually improve that if you work 30 40 60 80 meters but probably not notably.
In the event of a catastrophic storm that damages the roof of the home one of the ways people can prevent water intrusion is to have what is called a secondary water resistant swr barrier.
I have a gp 6 2 meter 440 vertical mounted on a metal pipe that is attached to one end of a metal roof.
If your antenna is mounted down low on the vehicle like on the bumper or behind a pickup truck s cab the signal can bounce back to the antenna causing a high swr.
Best bet would be to go with an outdoor antenna up on the higher part of the roof.
The antenna then converts this rf energy into electro magnetic energy which is radiated into space.
Cireofmi jun 14 2009.
This serves as a barrier to prevent the water from entering the home even after the primary barrier the roof covering system such as shingles or.
For the purpose of the wind mitigation inspection form 1802 a secondary water resistant barrier is a self adhering modified bitumen underlayment.
7 things to know before choosing a metal roof if your current roof is the root of your headache and maybe even a long list of costly home repairs consider these metal roofing pros and cons.
Basically this is a peel and stick type of material that is installed before the shingles.
