The CEL-FI GO G51 is a single-carrier signal booster built for bringing strong cellular service deeper inside buildings where outdoor signal isn't making it through. It delivers up to 100 dB of gain and supports n77 alongside one additional supported LTE/5G band at the same time.

That makes the G51 especially useful in offices, clinics, retail spaces, homes, and other buildings where one carrier needs better indoor coverage and C-band is available outside. It's a single-carrier, operator-approved, network-safe booster built for AT&T® and FirstNet®, amplifying 4G LTE bands 2, 12, 14, 17, and 25 (Band 14 for FirstNet) plus 5G NR n77 (3.7 GHz C-band). Because support is band-specific, confirm your usable outdoor signal is on one of these before choosing the G51.

If you need multiple carriers boosted simultaneously, consider the CEL-FI GO G43. If your strongest usable outdoor signal is on a band the G51 doesn't support like Verizon Band 13, the GO G41 is the better choice to access those bands.

Built for C-Band 5G

C-band n77 gives carriers access to much wider channels and significantly more capacity than traditional low-band spectrum. The tradeoff is weaker building penetration, especially through Low-E glass, concrete, masonry, and metal construction.

The G51 is designed to overcome that indoor coverage gap, supporting n77 with up to 100 MHz of bandwidth so high-capacity 5G service available outside can be effectively redistributed indoors.

High Gain and Dual Band Coverage

The G51 provides up to 100 dB of system gain, allowing it to work with weaker donor signals. It can simultaneously relay n77 plus one additional supported LTE or 5G NR band, combining the capacity of C-band with the broader coverage characteristics of lower-frequency spectrum. On n77, the G51 delivers up to 27 dBm of downlink output power for stronger indoor distribution.

• Up to 100 dB of gain: Pulls weak outdoor cellular signal indoors with substantially more gain than conventional consumer boosters.
  
• True n77 C-band support: Boosts up to 100 MHz of mid-band 5G spectrum for faster indoor 5G service.
• Dual-band operation: Relays n77 alongside one supported LTE or NR band simultaneously.
• High n77 output power: Delivers up to 27 dBm of downlink power on C-band for stronger indoor distribution.
• Single-carrier performance: Configure the G51 for the operator you need rather than installing a multi-carrier system where it isn't necessary.
• FirstNet ready: Supports Band 14/n14 for FirstNet deployments.
• WAVE monitoring: Use the CEL-FI WAVE app for installation and diagnostics, with WAVE Portal available for remote system management.

How is the GO G51 different from the GO G41?
Both provide up to 100 dB of gain and support 4G and 5G on compatible bands. The major advantage of the G51 is n77 C-band, with support for up to 100 MHz of 5G bandwidth. The G41 does not support n77; its 5G comes from DSS (Dynamic Spectrum Sharing), which shares existing low- and mid-band LTE spectrum with 5G rather than boosting dedicated C-band. The G41 does, however, support certain bands the G51 doesn't, including Verizon Band 13. Choose the G51 when C-band is the priority; choose the G41 when your best outdoor signal is on one of its supported legacy bands.

Does the G51 support FirstNet?
Yes. The G51 supports Band 14/n14, the dedicated FirstNet spectrum, so it's a strong fit for public-safety and enterprise sites that rely on FirstNet. It's operator-approved and network-safe, boosting FirstNet coverage without interfering with the network.

What coverage area can I expect?
There isn't a fixed square-footage rating, coverage depends on the outdoor donor signal, building materials, antenna placement, and the number of indoor antennas. As a general planning guideline, allow roughly 1,000–1,500 sq ft per indoor antenna in heavily divided spaces and 1,500–3,000 sq ft in more open layouts. The G51 can support multiple indoor antennas for larger spaces; sufficiently large or complex buildings may be better suited to a hybrid DAS such as CEL-FI QUATRA.

Does the G51 boost every band used by my carrier?
No. The G51 supports n77, 2/n2, 12/n12, 14/n14, 17, and 25/n25. It boosts one selected operator on the frequencies supported by the hardware, so it's important to identify which bands are actually available outside your building before choosing the G51.

Can the G51 boost 4G and 5G at the same time?
Yes. The G51 supports dual-band relay, allowing n77 5G to operate simultaneously with one additional supported LTE or 5G NR band. This lets the system combine high-capacity C-band with coverage from another cellular layer.