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SureCall Fusion 4 Cell Phone Booster

Installing a Cell Phone Booster in an RV
Article Date: November, 2017


Being connected to cell service is becoming more of a necessity than a luxury. But traveling in an RV oftentimes leads to out of the way places where cell signal strength can be very week, making it hard to catch up on your email, via the latest weather app, or call or text with friends or family. In these more remote locations a cell phone booster can make the difference between getting a strong, usable signal or being out of communication.

Specific units are available for RV applications, many offer the ability to operate on 12 volt battery power. But many motorhomes are equipped with inverters that utilize 12 volt battery power to provide 120 volt AC power. These units generally provide more power at a better price and are a better value for any modern motorhome owner. For my particular choice I selected a Fusion 4 booster by SureCall. SureCall makes various models but this model offered the best price versus performance value.

Cell phone boosters are equipped with two antennas. An outside unit communicates with the cell tower and connects to a control module which amplifies the incoming signal, then rebroadcasts the stronger signal through an interior antenna which communicates with your cell phones or air cards. The Fusion 4 can be configured with various outside antenna choices. Because these systems are designed for residential use, the best antenna will vary depending on the layout of the residence. A flat panel or yagi antenna is very directional and will give you the strongest signal but it must be aimed at the cell tower, which works fine in a fixed base application but not so great for an RV which moves around from location to location. An omni-directional antenna will have a bit less of a signal but can pick up cell signals within a 360 degree radius of the antenna so this is the best choice for an RV.

Cell Booster Technology

The outside antenna communicates with the cell tower. In a fixed base location you would utilize a cell phone app to locate the strongest signal area for mounting your antenna but in an RV this isn't necessary. However, you do want the outside antenna to be located outside the RV to eliminate any signal degradation caused by steel or aluminum wall studs or roof joists. Similarly, you don't want to mount it right next to a rooftop air conditioner which could also cause interference with the cell tower's signal. It's recommended to keep a minimum 12" radius around the antenna clear of obstructions or radiating elements. A second consideration is that the inside and outside antennas need to be separated from each other by a reasonable distance. The signal booster has a small rubber ducky style antenna that attaches directly to the booster so you'll want to locate the signal booster and outside antenna as far away from each other as possible. To achieve maximum signal boost the antenna separation should be 40' or more. If the separation between the two less you may have to dial back the signal strength on the booster module. Obviously, the best location for the outside antenna is on the opposite side of the RV as the signal booster

The outside antenna connects to the booster via a supplied coax cable. This cable needs to be run from one end of the RV to the other end where the booster is located. The signal booster also needs to have power in order to operate. A small transformer plugs into a standard 120 volt receptacle and provides low voltage power to the booster. These are considerations to take into account when deciding which end of the RV to place each component.

Not every cell service uses the same band. Some brands of boosters may not work on your particular cell service and even if it does, should you ever change cell service providers in the future you might be stuck with a booster than no longer works with your new provider. The SureCall Fusion4 handles all 5 bands - LTE-E, LTE-V, Cellular, PCS and AWS. It handles all cellular standards. The booster itself draws less than 15 watts of power.

The Installation

Step one was to decide where to mount the components. I had 120 volt power receptacles in the front overhead cabinet and easy access to get up through the roof to run the coax cable to the back of the coach where I could easily mount the outside antenna. The roof mounted awnings were flanked by raised portions on the front and rear cap, which made it easy to access the front cap area to feed the coax cable to the signal booster and also gave me a place on the rear cap to mount the outside omni directional antenna. This gave my about 45' of separation between the two, which was ideal.

The outside omni-directional antenna came with an offset bracket to mount the antenna to. This bracket can be mounted directly to a flat surface or it can be mounted to a pipe mast with the enclosed u-bolts.

The signal booster is equipped with attenuating knobs to reduces the signal amplification in areas where the outside antenna is too close to the signal booster's inside antenna.

I chose a location on the backside of the front cap where I could fish the coaxial cable into the front
cap area where the signal booster would be located.

I used a drill to make a hole large enough to pass the coax cable and nut through.

A fish tape bent too much so I used a piece of Pex tubing to fish through the fiberglass insulation
to the front compartment where the booster would be located.

Once the cable was through the cap I installed a cable access cover over the hole. Sikaflex sealant
was later applied over the cover to ensure a water-tight seal.

I chose a similar location on the rear cap to mount the outside antenna. The supplied bracket was
attached to the cap with large self-tapping screws.

The installed bracket. Sealant was later applied to prevent any water intrusion at the screw holes.

Dielectric grease was used at the coax connection on
the outside antenna to prevent any corrosion.

The outside antenna was mounted to the bracket with 3 stainless steel machine screws.

The coax cable was supported at intervals along the roof with stainless steel rubberized hose clamp.

Sikaflex sealant was applied over the screw heads on each clamp to prevent water intrusion.

Once all of the outside work had been completed I moved to the inside where I had fished the coaxial cable to for the signal booster. I removed a side panel in an overhead cabinet directly above the driver's seating position and brought the cable into that cabinet. I replaced the panel, mounted the booster to the panel and connected the cable. I then plugged in the AC power supply into a nearby outlet and connected it to the booster's power input port. The unit immediately fired up.

The booster was located in a front overhead cabinet.


The booster does a great job. In areas where I once had only 1 bar on my iPhone I now have three bars and a much stronger signal. Web pages render faster and apps run faster. The system was less expensive than the dedicated RV systems handles the latest 4G signals. The differences between the Fusion4 Home and the Fusion2GO RV is that the RV system only has a 50dB gain versus 72dB for the home system, the RV system costs more and it uses a 12 volt DC power connection versus 120 VAC. For a closer look at the Fusion4 Home system take a look at the Fusion4 Home Owner's Manual available on our server.


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