Acoperirea este bună acasă.

Because acoperirea is the definite form of acoperire.

• acoperire = coverage
• acoperirea = the coverage

Romanian usually adds the definite article to the end of the noun, instead of putting a separate word like the in front.

So:

• acoperire bună = good coverage
• acoperirea este bună = the coverage is good

In this sentence, Romanian is talking about a specific coverage situation, so the definite form sounds natural.

Because bună agrees with acoperirea, which is:

• feminine
• singular
• definite

Romanian adjectives must agree with the noun they describe.

Here are the forms of bun:

• bun = masculine singular
• bună = feminine singular
• buni = masculine plural
• bune = feminine/neuter plural

Since acoperirea is feminine singular, the correct form is bună.

Este means is and is the 3rd person singular of a fi (to be).

So:

• Acoperirea este bună acasă. = The coverage is good at home.

You normally need a form of a fi in this kind of sentence. You cannot simply drop it in standard Romanian.

In everyday speech, Romanians often use the shorter form e instead of este:

• Acoperirea e bună acasă.

That is very common and natural.

Acasă means at home or home, depending on context.

In this sentence:

• acasă = at home

It is an adverb, not a noun.

So Romanian does not say something like la casă here. You simply use acasă:

• Sunt acasă. = I am at home.
• Acoperirea este bună acasă. = The coverage is good at home.

Because acasă and în casă do not mean the same thing.

• acasă = at home / home
• în casă = in the house / inside the house

So:

• Acoperirea este bună acasă. = The coverage is good at home.
• Acoperirea este bună în casă. = The coverage is good inside the house.

The second version focuses more specifically on being inside the building, while acasă refers more generally to home.

Yes. Acoperire can mean coverage in several senses, including technical ones such as:

• mobile signal coverage
• network coverage
• service coverage

So this sentence could naturally refer to things like:

• phone signal
• mobile network reception
• internet/network availability

Depending on context, English might sometimes say signal instead of coverage, but the Romanian sentence itself is perfectly normal.

The sentence is flexible. Acasă can move, although the original version is completely natural.

Possible orders include:

• Acoperirea este bună acasă.
• Acasă, acoperirea este bună.
• Acoperirea acasă este bună. — less natural in many contexts

The most neutral version is the original one: Acoperirea este bună acasă.

Romanian word order is often more flexible than English, but not every possible order sounds equally natural.

Yes, this sentence is correct and natural. But in everyday conversation, people might also say something more specific, depending on what kind of coverage they mean.

For example:

• Semnalul e bun acasă. = The signal is good at home.
• Am semnal bun acasă. = I have good signal at home.
• E bună acoperirea acasă. = The coverage is good at home.

So your sentence is fine, but in casual speech semnal is also very common if the speaker means phone signal or reception.

It is formed by adding the feminine singular definite article to the noun:

• acoperire = coverage
• acoperirea = the coverage

This pattern is common with many feminine nouns ending in -e:

• întrebare → întrebarea
  question → the question
• rezolvare → rezolvarea
  solution/solving → the solution
• acoperire → acoperirea
  coverage → the coverage

So the ending -a here is not random; it marks definiteness.