Antop “Big Boy” AT-400B Outdoor/Indoor HDTV Antenna | Smartpass Amplified


  • New Generation digital tech design: matches mechanical antennas
  • UV coating, weather resistant finish
  • Whole-house solution: Can feed multiple TVs
  • Smartpass technology amplifies range up to 80 miles
  • 4G LTE Filter: blocks unwanted 3G and 4G signals
  • Multi-directional reception for weak signal strength areas
  • Easy home exterior installation: desktop, wall, roof, balcony
  • Size: 10.24 X 4.72 X 23.46 inch

Out of stock

AT-400B description


Outdoor HDTV Antennas Redefined Bringing beautiful design, new digital tech and crystal-clear TV reception to your home.

Meet the Antop “Big Boy” Outdoor Antenna AT-400B

The perfect combination of classic Yagi engineering and the new digital technology.
Stylish and sleek, keeps you connected to all the local TV content you want.
AT-400B description

Enjoy a lifetime of free HDTV family entertainment.

AT-400B description

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AT-400B description

Smartpass Amplified

with Built-in 4G/LTE Filter

The Antop exclusive, all-in-one Smartpass Amplifier balances the range for “Big Boy” AT-400B from 0, 65, to 80 miles, and blocks unwanted 3G/4G signals for noise-free reception.
AT-400B description

Simple Set-up

The simple set-up design enables you to quickly install and easily connect within minutes. The “Big Boy” offers an installation kit and table top stand for multiple positioning options.
AT-400B description

Durable Exterior & Weather Resistant

UV coated, weather resistant exterior design combined with anti-interference internal tech
protects signal reception to provide clear pictures and full channel capacity even during inclement weather.
AT-400B description

Always connected so you never miss the latest local news

The Antop Flat Panel “Big Boy” is the easiest way to get a wide range of free HDTV channels.
Plug and play. Enjoy crystal-clear TV reception.
AT-400B description

Stylish Design

Flat Panel “Big Boy”, exactly what you need and nothing you don’t. Its sleek and compact blends in with the interior or exterior of your home.
AT-400B description


Combining style and the latest in digital antenna tech to create a crystal-clear HDTV viewing experience.
AT-400B description

A Keeper

Engineered to pick up channels in difficult reception areas and powerful to feed multiple TVs throughout your home.
What's in box
AT-400B Description

Indoor, Outdoor, Attic, RV

Signal Strength

Weak Signal Areas

Received Band



Smartpass Amplified

Reception Pattern


Frequency Range

87.5-230MHz, 470-700MHz


14dB or 30dB

Max Output level


Noise Figure




Power Supply

DC12V via power adapter

Cable Length


Product Series

"Big Boy"

Working Temperature Range

-104 to 140 ℉

Wind Figures

6 mile/h = 0.69N ; 10 mile/h = 2.49N





Consumer Packaging
Weight 9.31 lbs
Dimensions 10.8 × 6.50 × 22.44 in
ANTOP User Manual
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