Signalen är stark hemma.

Signalen is the definite singular form of signal, so it means the signal.

• en signal = a signal
• signalen = the signal

Swedish usually adds the definite ending to the noun itself, instead of putting a separate word like the in front.

Because signal is an en-word in Swedish.

For most common-gender nouns:

• en signal = a signal
• signalen = the signal

If it were an ett-word, the definite ending would usually be -et instead.

Är is the present tense of vara, which means to be.

So:

• är = is / are / am, depending on context

In this sentence, Signalen är stark hemma, it means The signal is strong at home.

Because stark agrees with the noun it describes in a predicative structure, after är.

Here, signalen is:

• singular
• common gender (en-word)

So the adjective form is stark.

Compare:

• Signalen är stark. = The signal is strong.
• Ljudet är starkt. = The sound is strong.
  (ljudet is a neuter ett-word)
• Signalerna är starka. = The signals are strong.

So stark is correct because signalen is singular and common gender.

Because hemma means at home, while hem usually means homeward / home as a destination.

This is an important Swedish distinction:

• Jag är hemma. = I am at home.
• Jag går hem. = I am going home.

In your sentence, the meaning is about location, not movement, so hemma is the right choice.

Hemma is an adverb of place, and in a neutral sentence it often comes later in the clause.

So:

• Signalen är stark hemma.

is a natural, straightforward word order:

• subject: Signalen
• verb: är
• adjective/complement: stark
• place adverb: hemma

You can also move hemma to the front for emphasis:

• Hemma är signalen stark.

That sounds more like At home, the signal is strong.

Yes, it is natural.

It sounds like something you might say about phone reception, Wi‑Fi, radio reception, or another kind of signal. It suggests that the signal is strong when you are at home or in the home location.

Depending on context, Swedish speakers might also say things like:

• Det är bra signal hemma. = There is good signal at home.
• Jag har stark signal hemma. = I have a strong signal at home.

But your sentence is absolutely correct and natural.

Yes. Stark signal is completely normal Swedish.

It works much like English strong signal. You can use it for:

• mobile signal
• Wi‑Fi signal
• radio signal
• TV signal

So Signalen är stark hemma is a very ordinary and idiomatic combination.

Yes, often it could.

Hemma literally means at home, but in real use it can refer to:

• being at one’s home in general
• the home environment
• the house/apartment where someone lives

So depending on context, it can feel like:

• at home
• in my house
• where I live

The exact nuance comes from the situation.

A simple approximate pronunciation for an English speaker is:

sing-NAH-len air star-k HEM-ma

A few notes:

• gn in signalen is pronounced like the ng sound
• ä in är is somewhat like the vowel in English air
• stark has a clear r and a crisp final k
• hemma has stress on the first syllable: HEM-ma

If you want to sound more natural, keep the rhythm fairly even and stress mainly:

signAlen är STARK hemma

Because Swedish usually expresses definiteness by adding it to the noun, instead of using a separate article.

So:

• the signal = signalen

This is one of the biggest differences from English. In many cases, Swedish does not need a separate word equivalent to the because the noun ending already shows it.

Grammatically, en signal means a signal, but that sentence would usually sound odd without more context.

• Signalen är stark hemma. = The signal is strong at home.
  This sounds like a specific, known signal.
• En signal är stark hemma. = A signal is strong at home.
  This sounds less natural unless you are contrasting one signal with another.

In normal everyday Swedish, if you are talking about your phone or Wi‑Fi reception, signalen is much more likely.