I have a gp 6 2 meter 440 vertical mounted on a metal pipe that is attached to one end of a metal roof.
Improve swr metal roof.
When you transmit you are sending radio frequency energy along your feedline usually coax to your antenna.
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.
The feed line is lmr400.
Also try the indoor antenna by the windows.
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.
Cireofmi jun 14 2009.
For the purpose of the wind mitigation inspection form 1802 a secondary water resistant barrier is a self adhering modified bitumen underlayment.
Often the critical frequency for nvis is below 40m like 5 mhz and down.
When we got a lot of snow recently the swr went to 8 10 or higher.
Swr cost appears to vary widely based on articles i have read and a quick web search but i would expect probably in the range of 0 10 0 15 sf of total roof for only the joint sealing product 1 20 1 40 sf extra for the full coverage sheet installed product done as part of a normal reroof job.
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.
Not an expert but the metal roof should block the signal.
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.
Basically this is a peel and stick type of material that is installed before the shingles.
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.
The sheet product itself runs about 1 00 sf.
Swr or standing wave ratio is a measurement of antenna efficiency.
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.
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.
Best bet would be to go with an outdoor antenna up on the higher part of the roof.
