Questions tagged [antenna]

Questions about antennae, the typically-long-and-thin things used by aircraft to send and/or receive radio signals (for communication and/or navigation and/or other things as well).

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4
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2answers
3k views

What are these “winglets” on the roof of the 737?

I circled the parts on the fuselage in red.
0
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1answer
254 views

What are the names of the antennas which I have marked in this picture of a Boeing 737?

I have taken the picture from PMDG 737NGX Microsoft flight simulator X. I am really curious to know what this antennas are. These antennas are behind the nose gear.
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0answers
79 views

Can you identify these antenna/items on the belly of a Cessna 172? [duplicate]

Not sure what all these antenna are for. I have my checkride soon and want to make sure I can name everything that might be pointed out. Thank you.
2
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0answers
110 views

An-225 antenna layout

Does anyone have a good reference or information about the antenna layout on the An-225? Particularly interested whether the VOR antennas are up on the V-Stabs, or somewhere more creative. Thanks in ...
2
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1answer
58 views

Converting lat long & altitude into a line of sight target? [closed]

I want to design a long-range ADS-B receiver with a directional antenna (like a Yagi), but in order to maximize its range, I'll need to orient the antenna towards a target (plane) based on existing ...
5
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1answer
570 views

Can you identify this antenna on a Cessna 172N?

Does anybody know what this antenna is used for? I suspect a glideslope antenna but I am not totally sure.
0
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0answers
94 views

Can you identify this ILS/VOR antenna?

I'm looking for an ILS/VOR cheap and lightweight antenna. I can see there are several models (p.e. aircraftspruce catalog) but the following one drew my attention: All I know is it's being used by a ...
2
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1answer
598 views

What is this “stick” on top of Cessna 152's wing, and how does it work? [duplicate]

What is this device? What is it for? Seems that some variants have only one, while some others have two. Added: As some have two, so what are they? The answers and comments have not explained which ...
1
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2answers
203 views

Why did this old Japan Nakajima J1N airplane use a Yagi rather than a parabolic antenna?

Picture source. As per my understanding, a Yagi antenna is a directional antenna with limited gain, which it broadcasts or receives the microwave signal to and from the front side. It can only ...
2
votes
1answer
127 views

How much extra drag does an external HF antenna incur?

As seen in the picture, some older planes have external HF antennas that run from the fuselage to the tail. Have any studies found the wire to be a significant source of drag or is the difference ...
4
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1answer
115 views

Is this a type of navigation aid?

I saw this contraption on the southeast corner of Eastern West Virginia Regional Airport, Martinsburg, WV (MRB). My first thought was this was some kind of NDB antenna but not sure.
0
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2answers
540 views

AWACS - what do these antennas do?

In a press release for a new Boeing "wingman" (BATS) drone being built in Australia, a closeup of this Australian AWACS flying in formation was provided. What would be some of the specific uses for ...
2
votes
3answers
944 views

What are the radio characteristics of communications between tower and aircraft?

I have a few questions on the types of antenna used for tower-aircraft comms. What type of antennas are used today for tower-aircraft comms? Are they directional or omni-directional? What's the ...
1
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1answer
237 views

How the Log Periodic Dipole Antenna of Localiser help in varying modulation depth?

Here Albert Helfrick speaks about 40% modulation depth for each tone in a localiser radio signal. However latest manuals of ILS manufacturers and google source speaks about 20% modulation depth, not ...
5
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1answer
3k views

Which antenna on an commercial airline airplane is used for the transponder (SSR)?

On the 767-200 image I see no SSR antenna, but since that TCAS uses the transponder I guess that are sharing the same antenna. Am I right ?]1
12
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1answer
3k views

How are antennas integrated into stealth aircraft?

In Hephaestus Aetnaean's answer to this question, it is mentioned that the F-117 had no radar detection equipment because at the time it was developed the designers had not figured out how to ...