Communal satellite dish: why only some channels come through

A communal satellite dish only picks up one polarization, and that cuts out free-to-air channels

A shared antenna installed to serve a block of residents cannot receive every free satellite channel, according to a forum user. It is not a technician's mistake or a fault: it is a physical limitation of the installation, at least according to that explanation. The communal dish works with a single polarization, vertical, the one used by the pay platform it was set up for. Anything broadcasting in horizontal is out of the receiver's reach, no matter how much you configure it by hand.

The case comes from an apartment building in Asturias, Spain, where the antenna has been unused for a while and the channels have gradually dwindled to almost nothing. The person asking wants something specific: free-to-air channels in Spanish, English, French and regional Spanish channels, without paying a cent. And the answer he gets is less friendly than he expected.

What you can watch on a communal satellite dish

The shared installation is designed for a pay package, not for squeezing the satellite dry. That means the receiver will only find the free channels broadcasting in the polarization the antenna is set to. In practice, a satellite scan filtered to free channels returns a handful of signals, according to the list shared by the poster: RT Español, Telesur, Andalucía TV, TV Galicia and TBN, all of them free-to-air and vertical.

The technician who came to check the installation said it bluntly, according to the poster's account: the communal dish has less bandwidth, and to see everything the satellite offers you need an individual antenna. The explanation holds up, even though the poster suspected he was being fobbed off. An individual dish lets you aim at a specific satellite and pick up both polarizations, which multiplies the available offering.

Astra and HotBird: the two satellites that matter

From Asturias you can receive the most popular satellites in Europe, according to the forum. Astra, at 19.2 degrees east, is probably what the building's antenna points at, and it carries most of the German channels plus a good number of international ones. HotBird, at 13 degrees east, offers another batch of free-to-air signals, many in English and French. Both cover Spain.

To pick up both with a single dish there is the monoblock LNB, a device that points simultaneously at two nearby satellites. The technician ruled it out as poor value in a communal installation, according to the poster's account, but it is the usual route for anyone who wants to expand their options without mounting two dishes.

Alignment and satellite finders

The poster noted that his antenna faces southeast, an orientation that does not match Astra's. The communal antenna has drifted out of alignment over time and the channels have been disappearing. To fine-tune the alignment you need a satellite finder, a device that measures signal quality and lets you move the dish until you find the optimal spot. It is not expensive, but it requires physical access to the antenna, which is tricky in a communal installation.

The uncomfortable conclusion from this case: the communal dish is not designed to maximize free channels. It is designed to deliver a minimum paid service. Anyone who wants to make the most of the satellite will have to consider an individual dish, with a dual-polarization LNB and, if they want more, a monoblock for two satellites. The question left hanging is how many residents are paying for the upkeep of an installation that no longer gives them what they thought it did.