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Old 09-05-2016, 05:13 PM   #15
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Originally Posted by vsheetz View Post
That's a 24" solid antenna. It will get hit by trees and stuff and has no give. That it has LMR 400 cable is good for low loss, but it's large and stiff for routing through a MH. Not an antenna I would use, IMHO.

The antenna I described is flexible and about 18" tall. About 15' of LMR 600 similar cable (smaller and more flexible) which reaches inside as I described.
Those are really good points. Thanks!

I guesstimated it's only going to protrude about 12" above the AC units, but I was just thinking about hard clearances, not about tree branches. One of the dangers of having no experience with RVs and then leaping in with one foot (the other firmly in mouth along with the tray table in the upright and locked position)

I never thought about cable size! When I worked with radios everything I did was RG58 so it never even occurred to me that physical size might be significantly different.

Sounds like I need to rethink that one.

Thanks much for the help!

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Old 09-05-2016, 05:25 PM   #16
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Originally Posted by Starsekr View Post
First let me apologize for the harsh tone of my earlier comment. Mr. vsheetz is correct, a roof mounted antenna without some spring or flex mounting is waiting for an argument with a tree limb. If it was magnet mounted, the magnet might give way before anything broke. But then thou have an antenna rolling around on the roof. You might consider rethinking equipment placement. The gain you get from that 12 db antenna is quickly lost in the 50 foot coax cable. If you are mounting the WiFi at the rear, the rear ladder is a possible antenna mount, if you don't plan to use the mifi on the road, we have used a small antenna that sticks onto a steel bolt in the awning rail, with a short cable coming inside the passenger window.
No need to apologize, after few years in the submarine service and 31 years of online interactions, you'd have to drill deep to find the bottom of this thick skin (and head! ) I was sloppy in my wording and it confused pretty much everyone.

The solar guys recommended front mount on the antennas to stay out of the way of the panels. The kitchen table is right about 1/3 of the way back and that's where I'll be working from, so a forward mounting also gets me the shortest cable. Plus I'll get instant gratification from the sound of them snapping off on tree branches (as vsheetz pointed out) rather than having to wait that extra few seconds for the rear of the coach to get there.

It occurred to me while I was responding to folks here that maybe I should wait until after the solar panels are installed, I can probably piggyback on one of their legs (does that sound as perverted to everyone else as it does to me?) (Hmm....I thought not...) and save myself some effort.

I have no clue what all that extra metal on the roof will do to reception either way. Really need a hydraulic mast for the antennas like on a boat.

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Old 09-05-2016, 08:27 PM   #17
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Extra metal will probably be to the good. One of the big problems with antennas on fiberglass rv's is the lack of a "ground plane" or "counter poise". You may be able to use part of the solar structure to mount or protect your antenna

Jim and Valerie, 2005 Winnie Adventurer 37B, 2014 Subaru Forester Toad, hitches, brakes, anti-sways, autopilot, gourmet food on a Social Security budget.
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