5 Bars Everywhere Guaranteed Or Your Money Back
Instantly boost mobile signal and data in your whole home. Works with all UK networks.
Trusted by 18,000+ UK Homes
60-Day Trial · Free Shipping · 3-Year Warranty
Why You’ll Love It
-
CE & RoHS Certified
-
Free Returns
-
All UK Networks
-
3G/4G/5G Calls & Data
-
Plug & Play Setup
-
Multi User. Multi Device
60-Day Risk-Free Trial
3-year Warranty
Free Shipping & Returns
Signal Hero Max 300 Pro (SH7891821-300-PRO)
-
Works on EE, O2, Vodafone, Three & more
-
Supports 3G / 4G / 5G – Calls & Data
-
Coverage up to 300 m²
-
Multi-User & Multi-Device Compatible
-
15-Min DIY Setup
-
98.7% Success Rate
-
Crystal-clear calls & strong data everywhere
-
Instant signal boost the moment you plug it in
-
Longer phone battery life – no endless searching
-
Professional-grade tech
-
Enjoy stress-free connectivity in every room
-
60-Day Free Trial + Free Returns
-
3-Year Warranty – Full Coverage
-
Guaranteed 5 Bars or Your Money Back
-
24/7 UK Tech Support
-
CE & RoHS Certified
Available upgrades
£965
Add Indoor Aerial Expansion Kit!
* Provide coverage in another portion of home
Add Indoor Aerial Expansion Kit!
* Provide coverage in another portion of home
Panel Aerial
£35 value
Coaxial Cable
£45 value
Splitter
£55 value
Recommended Add-Ons
(Optional)
Available 24/7
Online Now
Our Signal Specialists are here for you.
Not sure which booster is right for you?
Don't guess. Get the perfect match.
Take the Quiz.
Get your personalized recommendation
What’s in the Box
Booster Unit
Indoor Aerial
Power Supply
15M Outside Cable
5M Inside Cable
Outdoor LPDA Aerial
Mounting Bracket
15M Outside Cable
Cable Mounting Clips
Try Signal Hero – 100% Risk-Free
Boost your signal with confidence. Enjoy a 60-day trial, 3-year warranty, and no-questions-asked FREE returns. Guaranteed 5 Bars or your money back.
-
Free UK Shipping
-
CE & RoHS Certified – Zero interference
-
24/7 UK-Based Tech Support
-
750+
Verified Reviews
Why You'll Love It
CE & RoHS Certified
Free Returns
All UK Networks
3G/4G/5G Calls & Data
Plug & Play Setup
Multi User. Multi Device
Signal Hero vs Other Brands
| Signal Hero | Others | ||
|---|---|---|---|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
* Comparison based on like-for-like models and published policies.
Why 18000+ Customers Choose Signal Hero
1
5 Bars, Guaranteed
Money-back if you’re not delighted.
2
Boost Starts in Seconds
Clear calls & faster data after power-on.
3
15-Minute DIY Setup
Plug in, connect antenna, done
4
Save £200+/yr on battery
Stops signal-search drain
5
Works in Weak-Signal Areas
Pro Kit handles 1–3 bars outside.
6
No Monthly Fees—Ever
No SIMs, apps, or subscriptions.
3 Steps to Full Bars
Place the Outdoor Antenna
Mount the antenna where you get the best signal.
Connect the Booster Inside
Plug in the booster and connect to the antenna.
Enjoy Full Bars Everywhere
Clear calls,fast data, and no more dead zones.
FINAL OFFER
Signal Hero Max 300 Pro
(up to 300 sqm)
Fix Poor Signal Forever - Or You Don't Pay
WHAT YOU GET
-
Signal Hero Booster Kit
£965£295
Full-Home Coverage
(69% OFF)
-
15-Min DIY Setup Guide
FREE
No Tools Needed
-
Works with All Networks
Included
EE, O2,Vodafone,Three, etc.
-
Instant Boost
Included
(Calls + Data 3G,4G,5G)
FREE BONUSES TODAY
-
Wi-Fi Signal Booster
£69FREE
-
3-Year Extended Warranty
£99FREE
-
Free UK-Wide Shipping
£12.95FREE
Your Bundle Price: £965
SAVE £670Limited-time promo ends in:
Only 16 left at this price.
Use Code SIGNAL20 — Save £20
60-Day Risk-Free Trial
98.7% Success Rate | 0+
Reviews
See It In Action!
Over 1200+ five-star reviews
JOIN 18K+ HAPPY CUSTOMERS
Award-Winning Signal Booster (2025 Winner)
Always reachable when it matters
High-gain amplification with auto-gain control keeps your phone connected across the house-so calls go through when you need them most.
Full bars-even in weak-signal homes
Got only 1-3 bars? The Pro Kit makes it strong throughout your home.
Work without interruptions
Stable upload and clear voice for Zoom/Teams. Boost supports 3G/4G/5G calls & data-perfect for hotspotting and video calls.
FINAL OFFER
Signal Hero Max 300 Pro
(up to 300 sqm)
Fix Poor Signal Forever - Or You Don't Pay
WHAT YOU GET
-
Signal Hero Booster Kit
£965£295
Full-Home Coverage
(69% OFF)
-
15-Min DIY Setup Guide
FREE
No Tools Needed
-
Works with All Networks
Included
EE, O2,Vodafone,Three, etc.
-
Instant Boost
Included
(Calls + Data 3G,4G,5G)
FREE BONUSES TODAY
-
Wi-Fi Signal Booster
£69FREE
-
3-Year Extended Warranty
£99FREE
-
Free UK-Wide Shipping
£12.95FREE
Your Bundle Price: £965
SAVE £670Limited-time promo ends in:
Only 11 left at this price.
Use Code SIGNAL20 — Save £20
60-Day Risk-Free Trial
98.7% Success Rate | 0+
Reviews
Your Questions, Answered.
Filter by
Installing our boosters is easy - in fact, 98% of our customers do it themselves. The device is plug-and-play, so all you need to do is attach the units with cables and mount the antennas. We provide simple installation guides and videos to help you along the way. Moreover, we offer technical aftersales support after the delivery of your device, so you can have peace of mind knowing we're here to help.
If you want to find the best booster for you there are 2 easy options: Use our Booster Finder Wizard to find the best booster based on your needs. If you're still having trouble finding the right booster after using the Wizard, contact our technical support team via chat or phone. They'll be happy to assist you in finding the best solution.
1. At Signal Hero, we are committed to providing high-quality boosters at unbeatable prices. 2. Since 2010, we've been dedicated to improving cellular signals with our specialized boosters, putting our CUSTOMERS FIRST every step of the way. 3. Our boosters fix more than the signal. Signal Hero customers enjoy fewer dropped calls, better voice quality, faster internet speeds, and improved video streaming. 4. In addition, we provide peace of mind with our industry-leading 24/7 after-sale service: - Lifetime Support - 3-Year Warranty - Installation Services (for enterprise solutions) 5. And if it’s not a perfect solution for you, we’ll refund your purchase or replace it. No hard feelings.
Signal Hero mobile signal booster is the only working solution if you have a weak signal and dead zones. It helps to improve signal strength so you can access the internet more quickly, and stream videos without buffering. With our booster you can make and receive calls without interruption, ensuring you're always in touch with your family and friends. In general, the booster catches the signals from the nearest cell tower in the area by the external antenna which is included in the kit, then it sends the signal to the booster box. The box amplifies the signals, ensuring reliable coverage even in areas with poor signal strength, and the internal antenna spreads the signals inside the closed area.
Yes. This is exactly the type of situation the booster is designed to improve. The system captures the available signal outside your building using the aerial, then amplifies it and distributes it indoors through the internal antenna. When there is usable signal outdoors, the booster can significantly improve indoor coverage. Customers typically move from unreliable indoor signal to stable, usable coverage that supports clear calls and consistent mobile data throughout the coverage area. If you are unsure about signal levels at your property, our team can guide you before or after purchase to help optimize the setup.
NETWORK COVERAGE
Vodafone, VOXI, Lebara, Asda Mobile, Talkmobile: Band 20, Band 8, Band 3 , Band 1 and Band 7 - 800/900/1800/2100/2600 Mhz
O2, giffgaff, Tesco Mobile, Sky Mobile, Lycamobile: Band 20, Band 8, Band 3 , Band 1 and Band 7 - 800/900/1800/2100/2600 Mhz
EE , BT Mobile, Plusnet, 1pMobile : Band 20, Band 8, Band 3 , Band 1 and Band 7 - 800/900/1800/2100/2600 Mhz
Three , SMARTY, iD Mobile : Band 20, Band 8, Band 3 , Band 1 and Band 7 - 800/900/1800/2100/2600 Mhz
MAX GAIN
72 decibels (dB) amplification
IMPEDANCE
50 Ohm
POWER
DC 12V/AC 220V
BOOSTER WEIGHT
≤2.5 kg
BOOSTER DIMENSIONS
250 × 230 × 50 mm
PRODUCT ID
LEGAL COMPLIANCE
Safe for DIY Installation
Smart Features, Made Simple
1
ALC
Auto-optimized signal
Prevents overload or weak performance by auto.
2
AGC
Stable calls & data
Keeps conversations and browsing smooth.
3
MGC
Pro tuning on demand
Installer control for complex setups.
4
Install
Install check
Warns you if setup isn’t correct.
5
Anti-osc
Anti-feedback
Blocks interference loops that cause instability.
6
Standby
Energy smart
Reduces noise and saves power when idle.
7
Codes
Fault code alerts
See exact fault code for fast fixes.
8
Tuya
Remote control
Monitor & adjust from your phone.
9
LCD
Live signal LCD
Real-time strength per band.
Excellent
Rated 4.9/ 5
Based on 72 review
Online Now
Signal Experts Available 24/7
Get expert help choosing the right signal booster.
Free consultation • No obligation
Average response time: Under 2 minutes
Energy-Efficient
High-Gain Amplifier