Use a button instead of a wave

Question

This recipe does not make any sense but each step has its own by-product.

1. Add a letter and you'll have the shortest and the most ambiguous answer.
2. Add a letter and you'll have 47 machine-guns.
3. Add a letter and you'll have a software that goes beyond.
4. Add a letter and you'll be splitting logs.
5. Add a letter and you'll have a shelter in the woods.
6. Add a wave and you'll have a store.

Have fun!

Answer 1

The final answer is

RadioShack

The title

is a reference to a radio button

1. Add a letter and you'll have the shortest and the most ambiguous answer.

K - an abbreviation for 'OK'

2. Add a letter and you'll have 47 machine-guns.

AK - ak47 is a machine gun

3. Add a letter and you'll have a software that goes beyond.

ACK - an acknowledgement in data networks What the OP intended was this.

4. Add a letter and you'll be splitting logs.

HACK

5. Add a letter and you'll have a shelter in the woods.

SHACK

6. Add a wave and you'll have a store.

RadioShack - (thanks @sousben) a type of wave is a radio wave