Everyone seems to have the need to "stay in touch," these days.
Sadly, the traveling RV writer is no exception. We need to be
"connected" no matter where we go. A friend of ours describes his cell
phone as, "My electronic leash." If you too, have the real need (even
if not the desire) to stay in cellular phone range, you’ve no doubt
suffered the woes of spotty cellular coverage.
Cell phones are low powered, high frequency devices, and hence
subject to blinking out when you most need them. We discovered early on
that if our cell phone was really going to be of much help, the
standard-equipment antenna just wouldn’t cut it. To make our phone far
more reliable, we had to use an external antenna. Mind you, not all
cell phones offer this capability--check your owner manual.
For us, we first started parking the cell phone antenna on the roof
of our tow vehicle -- which was fine when we were in the truck or near
enough to grab the phone when it rang. But when inside the RV it wasn’t
always possible to hear--much less reach--the insistent little device.
We had plenty of "missed call" legends appear on our phone’s display.
Finally, the light came on. There are ways to hitch up a cell antenna
to your RV.
The Roof Vent Trick
Our fifth wheel came equipped with a roof vent over the bed area.
This was handy, as our traveling office is located there. The roof vent
was not your typical, plastic-dome variety, but rather, a flat
galvanized metal lid. It didn’t take long to discover that we could
perch our magnetic mount cell antenna on the roof vent, and route the
lead wire down into the rig by removing the bug screen, installing the
cable, and replacing the screen. As far as the cell phone was concerned
this was great. The number of signal "bars" increased from a non-usable
one to a clear signal rating five bars.
The drawbacks? In hot weather, when we needed to fully open the roof
vent to clear the air, the orientation of the cell antenna went from a
useable vertical to a useless horizontal. We did our best to work
around the situation, until the day came when the roof vent started to
leak and needed replacing. The Queen declared that a "tin roof" over
her bedchamber was just too noisy in the rain, and so a plastic dome
vent was called in for duty. This left us with no handy magnetic
surface on which to affix our cellular antenna.
Antenna Plate Possibilities
Our rig roof is aluminum. This makes for a great expanse of metal
for a "ground plane" which helps with the transmission of cellular
signals--but the external antenna requires a surface to which a magnet
is attracted. Aluminum and magnets are about as compatible as my cousin
Bumblemeir and his wife, so something more was needed.
Enter the antenna plate. A piece of thin, galvanized sheet metal was
acquired. With the help of friendly tin bender, the sharp edges of the
plate (in itself, about 6" x 12") were carefully bent over on the
sheet, leaving a smooth edge on all four sides.
Next, we located a suitable piece of roof real estate, essentially
above my desk area. Strips of butyl tape were affixed to the edges of
the antenna plate on its "ugly" side. The plate was then pressed into
the roof, sandwiching the butyl tape to the roof. One inch sheet metal
screws firmly moored the plate to the roof, at 2" intervals on center.
As a final step against weather problems, each of the screw heads was
"dabbed" with acrylic caulk.
Next, we carefully figured where to blast a hole through the roof
into the coach. In locating the hole, we took into account likely wire
runs for lighting circuits so as to avoid drilling through
ceiling-routed wiring. We also located the hole as close to the area of
phone use as we could. We also attempted to account for wall
thickness--so that our hole would actually blast all the way through
the ceiling, and not wind up somewhere inside a wall. Here is where the
tech tumbled--our hole could have been much closer to the exterior
wall. Live and learn. The hole size was determined by drilling the
smallest hole that would allow the passing through of the phone
connector on the end of the antenna lead.
I gritted my teeth as I bored the hole down through the roof and
into the coach--but nothing exploded and everything seemed intact. We
then passed the phone connector from the roof into the coach, and then
finished off the installation of the cable by placing an appropriately
sized rubber grommet around the hole in the ceiling. We later plan on
painting the ceiling, and the grommet will be camouflaged with the new
paint.
At the roof top level, we plunked the magnetic base of the antenna
down in the center of the antenna plate. The acrylic caulk was trotted
out to seal the lead wire hole. Yes, we used plenty of it, and when we
did, we tried to make sure it didn’t leak down into the coach. It’s
best NOT to use "self leveling" caulk for this part of the game. We
then hooked up the phone, and viola, the signal was good and
solid--actually even a bit better than with our roof vent mount.
Antenna Hindsight
Better measurement of the wall thickness would have kept the Queen
happier--having the lead sticking down from the inside ceiling dead
above the center of the desk is a bit disconcerting. Had we not been
concerned about boring into a roof-mounted solar panel, we would have
drilled from inside the coach to the roof. Part of this dislocation
problem was overcome by using adhesive backed "cable clamps" from Radio
Shack to route the antenna lead wire more appropriately.
For folks with EPDM rubber roofs, you’d probably need to use a
larger chunk of metal for your antenna plate. You’d also want to use
approved EPDM lap cement to cover your screws, just in case you slip
and get any of the stuff on your roof.
If you don’t have the appropriate tools to work with sheet metal,
hiring the cutting and bending out to a sheet metal worker is not an
expensive proposition. Check under "sheet metal" or "heating
contractors" in the yellow pages.
So far, with several weeks behind us, the antenna has worked out
well. We did have one problem with a low-hung tree branch knocking the
antenna off the plate. That required dragging out the ladder to gain
roof access to stick it back in place. It didn’t take long to figure we
had a problem--with the antenna lead plugged in we didn’t get any
"gain" in signal strength, prompting a quick "look-see" from ground
level to spot the knocked over signal helper.
With our new external antenna plate in place, our trips into
"cellular hell" are fewer and fewer. Whether that’s a gain is best
measured by who’s calling.