• Channel Master CM-7778HD Amplify+ Adjustable Gain Preamplifier for Professionals, Part # CM-7778HD

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Other products by Channel Master
Item #: AM78HD
Part #: CM-7778HD
GTIN: 020572177788
Reg. Price: $149.95
Our Price: $119.95


Channel Master CM-7778HD Amplify+ Adjustable Gain Preamplifier for Professionals, Part # CM-7778HD

Amplify+ is an outdoor preamplifier designed for mast-mounting with the TV antenna(s). Professional installers may choose options for High gain, Low gain, FM signal blocking and band-specific dual antenna use if required.
Unlike the consumer-ready Amplify product, Amplify+ does not include a USB powering option for indoor use.

Outdoor Heavy-Duty Housing

Amplify+ is constructed of a die-cast metal housing with weatherproof ports to support outdoor installations in extreme weather conditions.

Adjustable Amplification

Amplify+ provides adjustable settings that allow the installer to select the appropriate gain required for a specific installation scenario, eliminating the potential issues encountered from either too much or too little gain. The internal switch can be placed at either a High or Low setting.

Adjustable FM Trap

Amplify+ provides a trap mechanism to block unwanted FM Radio signals from FM-enabled commercial TV antennas, which can cause interference with UHF and VHF television signals. Pass-through of FM signals can be enabled or disabled via an internal switch.

LTE Filtering

Like the consumer-ready Amplify product, Amplify+ provides LTE signal filtering. The proliferation of LTE signal towers and connected LTE devices are a growing cause of intermittent disruption of over-the-air broadcast television signals. These disruptions can result in weak signals, pixilation or even channel loss, and can be especially disruptive when an amplifier is used with a TV antenna.

What's included

  • AMPLIFY+ TV antenna amplifier
  • Power inserter
  • Power Adapter
  • Mounting Ubolt
  • (2) Mounting Screws
  • Weather Boots
  • Installation Guide


  • Improves signal quality
  • Dual Antenna Inputs (VHF & UHF)
  • Switchable FM Trap
  • Decreases pixilation
  • May increase number of channels
  • Ultra low noise
  • Adjustable gain
  • Blocks LTE interference from 3G/4G Smartphones and transmitters
  • EMI & FM Out of band filtering
  • Heavy duty rating for outdoor use
  • Mast mounted for close proximity to antenna

Limited Warranty

  • 90 days of parts and labor
  • 90 days of support through phone, online chat and/or e-mail

Technical Specifications

  • Impedance (Input and Output): 75 Ohm
  • Connector: F-type
  • Frequency range: 54MHz~88MHz, 174MHz~260MHz, and 470MHz~685MHz
  • Gain VHF: 23dB (High) / 16dB (Low)
  • Gain UHF: 26dB (High) / 20dB (Low)
  • Gain Combined: 23dB (High) / 16dB (Low)
  • Noise figure: 1.5dB
  • UL listed: Yes
  • RoHS compliant: Yes
  • Return loss: <-15dB
  • Input Voltage: 12-15 VDC
  • FM trap: 95-108 MHz; >13dB
  • Operating Temperature: -40 C to +60 C
  • Size (product): 3.25 x 5.25 x 7.75 in
  • Size (packaging): 8.125 x 3 x 5.125 in
  • Weight (product): 1.5 lb
  • Weight (packaging): 2 lb

FAQ's & Support Docs:

CM7778HD Product Sheet

CM7778HD Installation Guide



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