The Parts of a Satellite Dish
A satellite dish is a small system of cooperating parts. Here is every component you can see on a typical dish and what each one actually does.
Look closely at any satellite dish and you will find the same handful of parts, whether it is a tiny pay-TV dish or a large free-to-air reflector. Knowing what each piece does makes installation, aiming, and troubleshooting far more logical, because you can reason about which part is responsible when something goes wrong.
The reflector
The reflector is the bowl, the part most people picture when they hear "satellite dish." Its curved surface, usually pressed steel or aluminum, gathers the incoming signal and bounces it to a single focal point. The accuracy of that curve matters: a dented or warped reflector scatters signal and costs you reception. Most home reflectors are what is called an offset design, where the bowl is a slice of a larger parabola, which is why the arm appears to point below center rather than straight out.
The feed horn
At the focal point, the feed horn is the flared opening that actually collects the concentrated signal reflected off the bowl and channels it into the electronics behind it. On many modern home dishes the feed horn is built directly into the LNB as a single sealed unit, so you may not see it as a separate part. Its shape is tuned to the frequency band the dish is designed for.
The LNB
Mounted right behind the feed horn is the LNB (Low-Noise Block downconverter), the electronic heart of the dish. It amplifies the faint signal and converts it to a lower frequency for the trip down the cable. When the feed horn and LNB are combined into one component it is often called an LNBF. Because this part does so much of the work, and because it is a frequent point of failure, it has a full guide of its own: what is an LNB.
The arm (feed support)
The arm, sometimes called the feed support or feed boom, is the metal bracket that holds the LNB and feed horn out in front of the reflector at exactly the focal point. Its length and angle are set by the dish design and should not be altered. A bent arm moves the LNB off the focal point and weakens reception just as surely as a warped bowl does.
The mount and mast
The mount is the assembly that fixes the dish to your wall, pole, or roof and lets you adjust its aim. It typically allows movement in two directions: azimuth, the side-to-side compass bearing, and elevation, the up-and-down tilt. Fine adjustment bolts let you lock the dish precisely once aligned. The mast or pole must be vertical and rigid, because any flex or sag translates directly into a lost signal. Mounting choices and hardware are covered in the mounting options guide.
The cable and connectors
A coaxial cable, usually RG-6, connects the LNB to your receiver indoors. It carries the signal down and low-voltage power up to the LNB. The connectors at each end, typically F-connectors, must be weatherproofed outdoors, because moisture in a connector is one of the most common causes of a slowly degrading signal.
The receiver
Strictly speaking the receiver lives indoors rather than on the dish, but it completes the system. It tunes, decodes, and outputs the signal as television or internet. You can read more in our overview of satellite dish receivers.
The weatherproofing that ties it together
None of the parts above survive long outdoors without protection, so a properly built dish includes a layer of weatherproofing that is easy to overlook. The LNB is sealed against moisture, the cable connectors are wrapped or booted to keep water out, and the mounting hardware is galvanized or coated to resist rust. These are not accessories; they are the difference between a dish that lasts a decade and one that degrades in a season. When a well-installed dish slowly loses signal over months, corroded connectors or a cracked LNB seal are among the first suspects.
How the parts work together
In sequence: the reflector focuses the signal onto the feed horn, the LNB amplifies and converts it, the arm holds those two at the exact focal point, the mount aims the reflector at the satellite, and the cable carries the result to the receiver. Understanding that chain is the single most useful thing you can do before installing or troubleshooting a dish, because it tells you exactly which component to check when a specific symptom appears. For the physics behind it, revisit how satellite dishes work.