Antop “Big Boy” AT-401B Outdoor 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 75 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: 7.09 X 5.12 X 23.62 inch

AT-401B outdoor antenna


The Antop Flat-Panel AT-401B panel design is aesthetically pleasing and suitable to match a wide range of home exterior styles. The Multi-directional reception, UV coating and weather resistant finish and creative panel design, allow you to install your AT-401B antenna in various locations around the exterior of your home: wall, roof, balcony. It is also suitable for indoor use in an attic or placed on a table top. The AT-401B supports HDTV, 1080P TV and 4K ULTRA HD and is compatible with TV converter boxes or digital TVs.

The number of TV channels and programs that you can receive for FREE depends on the amount of over-the-air broadcasters in your area. With the Antop AT-401B, there is no monthly fee and no need to subscribe. Just plug into a TV, scan the channels, and then enjoy your TV shows!

Antop’s New Generation Digital Technology

smartpass amplifier1) Smartpass Amplifier, exclusive Antop technology, balances reception range.

 The Smartpass Amplifier’s all-in-one design allows easier connection, delivers correct balance between short and long range reception. It must be powered in order to function. Push the smart switch On or Off and select the switching with which more channels are received.
2) 4G LTE Filter: built into all Antop amplified antennas, blocks 3G and 4G wireless signals for noise-free digital reception.
3) High Gain reception technology, shielded for minimum interference.
4) Durable exterior, waterproof design with UV coating.
5) Supports VHF & UHF digital signals.
6) Mounting accessory options.

By following the simple tips below, you can enjoy FREE TV with your Antop Antenna:

– Re-scan the channels after each switching of the Smart Switch.
– Scan channels monthly to find all available channels including newly added or changed.
– Do not place or hide the antenna in/behind any metallic objects.
– Install the antenna as high as possible and near a window for better reception.
– Keep the antenna away from any high power consumption devices to avoid interference.

NOTE: Antenna effectiveness is influenced by the distance from signal origination point, station signal strength, antenna positioning, reflections from nearby structures and any power consumption sources. THE AMOUNT OF FREE OVER-THE-AIR CHANNELS YOU CAN RECEIVE WILL VARY BY AREA AND ANTENNA SELECTION, CHECK SIGNAL AVAILABILITY AT Antop Signalmaps.

What’s in the box

– AT-401B FLAT PANEL Smartpass Amplified Digital Outdoor/Indoor Antenna
– Power Inserter with Smart Switch
– AC/DC Power Adapter
– Indoor Stand
– 40ft Coaxial Cable
– Wall/Pole Mounting Kit
– Instruction/User Manual
– Instrucciones de Instalación en Español


Indoor, Outdoor, Attic, RV

Signal Strength

Weak Signal Areas

Received Band



Smartpass Amplified

Frequency Range

87.5-230MHz, 470-700MHz


Switch-OFF: 12.5dB; Switch-ON: 29dB

Max Output level


Noise Figure




Power Supply

DC12V via power adapter

Cable Length


Working Temperature Range

-104 to 140 ℉

Wind Figures

6 mile/h = 0.52N ; 10 mile/h = 1.88N

Product Series

"Big Boy"





Consumer Packaging
Weight 8.20 lbs
Dimensions 8.27 × 7.48 × 25.31 in
ANTOP User Manual
Customer Reviews

4.5 out of 5 stars

2 reviews

Let us know what you think...

What others are saying
  1. shoelover

    Very good antenna.


    It’s nice to get all the local HQ channels.
    Antenna arrived quickly and it works well.
    The installation was easy.

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  2. Firsttimemomat30

    Good antenna, a little pricy


    Our household became official “cord cutters” about a year ago. We use a digital antenna and streaming services only. We had a basic $30 digital antenna for the first year, to test the waters. We received about 30 channels (including duplicates of a couple), which was OK. We mainly used the antenna for PBS, football and a couple of CW shows.

    We decided to see if upgrading out antenna would give us any more channels, including CBS, which we didn’t get before. After installation the antenna I ran the auto program and received less channels than before. After several adjustments I finally was able to get CBS HD as well as some other Spanish channels.

    Overall, I’d say that I do feel that this antenna allowed for more channels to be added but I don’t know if that is only due to being able to mount the antenna on the side of the house. It did take a lot of adjustments to get the channel we were looking for, which is about 20 miles away. We do have a lot of tree cover in the area but the area where the antenna points is pretty clear. If you have a high point to mount this to you could probably get excellent results.

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