Rekkevidden øker.

Because rekkevidden is the definite singular form of rekkevidde.

• rekkevidde = range
• rekkevidden = the range

In Norwegian, the definite article is usually attached to the end of the noun instead of being a separate word. Since rekkevidde already ends in -e, the definite ending appears as -n in writing: rekkevidde + n = rekkevidden.

Norwegian often puts the at the end of the noun instead of using a separate word before it.

So:

• en rekkevidde = a range
• rekkevidden = the range

That means Rekkevidden øker already includes the idea of the.

Øker is the present tense of the verb å øke.

• å øke = to increase
• øker = increases / is increasing

So this sentence uses the normal present tense form.

Here it is intransitive, which means it does not take a direct object.

The sentence is simply saying that the subject changes by itself:

• Rekkevidden øker. = The range increases.

If you use øke transitively, then something causes the increase:

• De øker rekkevidden. = They increase the range.

So Norwegian uses the same verb both ways, just like English often does with increase.

Yes. This is the basic word order for a simple statement:

• Subject + verb
• Rekkevidden + øker

That is completely normal.

It also fits the general Norwegian rule that the finite verb comes in second position in main clauses. Since the subject is first, the verb comes right after it.

The letter ø does not have an exact English equivalent.

A useful approximation:

• shape your lips as if saying o
• but try to say a sound closer to e in bed

That gives you something close to ø.

So øker sounds roughly like UR-kər or EU-kər, but neither English spelling is exact. If you know French or German, the vowel is similar to the one in deux or schön.

It is a noun meaning range, reach, or operating distance, depending on context.

It is often used for things like:

• battery range
• radio or Wi-Fi range
• the reach of a weapon or signal
• figurative range, as in scope or reach

So even though the sentence is very short, rekkevidde is a common and useful word in several contexts.

Yes.

To make it negative, add ikke:

• Rekkevidden øker ikke. = The range is not increasing.

To turn it into a yes/no question, put the verb first:

• Øker rekkevidden? = Is the range increasing?

This is a very common pattern in Norwegian:

• statement: subject + verb
• yes/no question: verb + subject