Channel Master
Amplify+ Adjustable Gain Preamplifier for Professionals
Best professional-grade signal booster for complex, large-scale outdoor antenna installations.
The Amplify+ Adjustable Gain Preamplifier for Professionals (CM-7778HD) is a robust TV antenna signal amplifier built for demanding outdoor professional installations, including multi-dwelling units and commercial applications. It provides versatile 16 - 26dB adjustable gain across separate UHF and VHF inputs, allowing installers to precisely tailor amplification to avoid signal issues. This unit features a heavy-duty, die-cast metal housing with weatherproof ports for extreme durability. Essential filtering includes 3G/4G/5G LTE protection and a switchable FM Trap to eliminate radio interference. Note that this professional model does not include a USB powering option for indoor use.
$99.00
Owner Satisfaction
4.5
/ 5
Category Rank
55
/ 315
#55 in Signal Boosters
Price vs Category Average
-92%
Below average
Gain VHF
2316
/ +dB (High) / +dB (Low)
Who it's for
- Technicians needing precise signal balancing for complex antenna arrays
- Viewers struggling with weak signals in interference-heavy environments
- Installers requiring reliable hardware for permanent outdoor mounting
Who should skip it
- Budget-conscious homeowners seeking a simple, low-cost signal fix
- Casual users lacking the technical tools for precise calibration
- Minimalists wanting a straightforward, all-in-one plug-and-play solution
Performance breakdown
Signal Precision
Adjustable gain settings allow for surgical control over signal strength.
Interference Rejection
Integrated LTE filtering and FM traps effectively silence unwanted background noise.
Build Durability
Die-cast metal housing stands up to the harshest outdoor environmental conditions.
Installation Versatility
Separate UHF and VHF inputs provide flexibility for complex antenna arrays.
Noise Floor
Low noise figure ensures clean amplification without introducing unwanted signal artifacts.
User Accessibility
Professional-grade design requires technical expertise and dedicated mast-mounting installation.
Key Specs
Gain VHF
+23dB (High) / +16dB (Low)
Gain UHF
+26dB (High) / +20dB (Low)
Frequency range
54MHz~88MHz, 174MHz~260MHz, and 470MHz~609MHz
Noise Figure
1.5 dB
Impedance (Input and Output)
75 Ohm
FM Trap attenuation
>13dB Down (95-108 MHz)
Operating Temperature
-40 C to +60 C
What's Included
Amplifier, Power Inserter, Power Adapter, Mounting U-Bolt
Features
- 16 - 26dB adjustable gain for precise signal tuning
- Separate UHF and VHF inputs for band-specific setups
- Heavy-duty housing with weatherproof installation ports
- Integrated 3G/4G/5G LTE signal filtering
- Switchable FM Trap blocks unwanted radio interference
- Adjustable gain settings via internal High/Low switch
- Designed for mast-mounting near the antenna
- Durable die-cast metal construction
What customers say
This preamplifier earns high praise primarily for its adjustable gain control, a feature users find essential for challenging Over The Air reception. Reviewers note that this precise fine-tuning capability prevents signal overload common with fixed units, resulting in cleaner reception. Customers consistently report better channel stability and the ability to receive distant stations clearly. The build quality is considered professional grade, justifying the higher initial cost. The consensus is that the superior performance and critical flexibility provided by the precise gain adjustment make this an invaluable tool for optimizing complex antenna setups, despite requiring some user knowledge to set the levels perfectly.
Know before you buy
This model is specifically engineered for outdoor mast-mounting near your antenna. It lacks a USB power option and is designed for professional, permanent outdoor installations rather than indoor use.
Separate inputs allow you to connect a combined antenna or individual UHF and VHF antennas, giving you more control over your signal path. This is particularly useful for professional setups where you need to optimize reception for different broadcast bands independently.
You can toggle between High and Low gain settings using the internal switch located inside the housing. This allows you to fine-tune the amplification to prevent signal overload if you are located relatively close to broadcast towers.
Yes, the unit features a switchable FM Trap that provides over 13dB of attenuation for the 95-108 MHz range. Engaging this trap helps eliminate signal distortion caused by nearby FM radio broadcasts.
Yes, it includes integrated filtering specifically designed to block 3G, 4G, and 5G LTE cellular signals. This prevents mobile network interference from degrading your television reception.
The unit is built with a heavy-duty, die-cast metal housing and features weatherproof ports. It is rated for operation in temperatures ranging from -40°C to +60°C, making it suitable for demanding outdoor environments.
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