Kekuatan isyarat di bandar lemah, apatah lagi di luar bandar.

Kekuatan isyarat means signal strength.

• kekuatan = strength
• isyarat = signal

So this is a noun+noun combination, where the first noun explains a quality of the second: the strength of the signal.

If you said just isyarat, that would only mean signal, not signal strength.

Also, kekuatan comes from the adjective/root kuat (strong) with the circumfix ke-...-an, which often turns a root into an abstract noun:

• kuat = strong
• kekuatan = strength

In Malay, you often do not need a verb like is/are when linking a subject to an adjective.

So:

• Kekuatan isyarat di bandar lemah = The signal strength in the city is weak

Literally, it is more like:

• signal strength in the city weak

This is completely normal in Malay.

Malay does have words like ialah and adalah, but they are not usually used before adjectives in simple sentences like this.

Di bandar means in the city or in town.

• di = in / at
• bandar = city, town, urban area

So di bandar is a prepositional phrase telling you the location where the signal is weak.

A useful note: when di is a preposition meaning in/at/on, it is written separately:

• di bandar = in the city
• di rumah = at home

But when di- is a passive verb prefix, it is attached to the verb:

• ditulis = written
• dibuka = opened

Apatah lagi is a very useful expression meaning something like:

• let alone
• much less
• all the more so
• even more so

In this sentence:

• Kekuatan isyarat di bandar lemah, apatah lagi di luar bandar.

The idea is:

• If the signal is already weak in the city, then it is even weaker or certainly no better outside the city.

So the speaker is making a stronger second point based on the first one.

A few similar English translations could be:

• The signal is weak in the city, let alone outside the city.
• The signal is weak in the city, much less in rural areas.
• The signal is weak in the city, and even more so outside the city.

It often means rural areas.

Literally:

• di luar bandar = outside the city / outside urban areas

But in normal usage, luar bandar commonly refers to non-urban or rural areas.

So depending on context, you could translate it as:

• outside the city
• outside urban areas
• in rural areas

In this sentence, in rural areas is often the most natural English meaning.

Because lemah is the adjective describing kekuatan isyarat di bandar.

Malay often follows the pattern:

• Subject + adjective

So here:

• Kekuatan isyarat di bandar = the signal strength in the city
• lemah = weak

Together:

• Kekuatan isyarat di bandar lemah = The signal strength in the city is weak

This word order is normal and natural in Malay.

Yes. The comparison is implied by apatah lagi.

The sentence does not explicitly say:

• lebih lemah = weaker

But the meaning strongly suggests that conditions outside the city are at least as bad, and probably worse.

So apatah lagi creates the comparison indirectly.

That is why the sentence sounds natural even without repeating lemah or adding lebih.

You could think of it like this:

• It is weak in the city; outside the city, even more so.

Yes. The full idea is understood from context, but you could make it more explicit.

For example:

• Kekuatan isyarat di bandar lemah, apatah lagi kekuatan isyarat di luar bandar.
• Kekuatan isyarat di bandar lemah, apatah lagi di luar bandar lebih lemah.

These are more explicit, but less elegant. Malay often omits repeated material when it is already obvious.

So the original sentence is natural because the listener can easily understand that the missing idea is the signal strength is weak there too, or even weaker.

Yes. Bandar can refer to a town, city, or generally an urban area, depending on context.

That means:

• di bandar could be translated as in town
• or in the city

In this sentence, in the city often works well, especially because it contrasts with di luar bandar (outside urban areas / in rural areas).

It is natural and fairly standard Malay. It sounds appropriate in everyday speech, news reports, and general writing.

A few notes on tone:

• kekuatan isyarat sounds slightly more standard or neutral than very casual speech.
• apatah lagi is a common and natural expression, and it gives the sentence a slightly polished, emphatic feel.

So this is not overly formal, but it is a neat, well-formed sentence that you could definitely encounter in real life.