The article isn't just about wolf whistles, although it includes them, but more generalised sexual comments.
I have just been involved in a verbal/physical abuse and harrassment incident, so I've had the law on harrassment explained to me by the police.
A person has to experience two separate incidents from the same person/people for the police to consider harrassment. They are then obliged to act. The first stage is to give an informal warning that a person is upset by a particular action. If the behaviour continues, action can be taken in a magistrates' court and a harrassment order can be issued. If the person breaks the harrassment order, criminal proceedings can be started. Therefore, it's a long process and many people might just put up with it. I don't think they should.
Occasional wolf whistling is probably fairly harmless, but if somebody has to put up with it every time she walks into work (for example), I think the employer should be informed and warn the whistlers and take disciplinary action if necessary.
I experienced misogynistic comments when I first started work. Thinking back, I wish I'd reported them, because I deliberately avoided this person. As he was my line manager, I eventually ended up changing my job. As a teenager, I was tall, skinny and had blonde hair (I'm still tall ) and I used to wear clothes to cover up, which meant I couldn't wear mini skirts or tight tops, so I always felt a bit of a frump.
I hated wolf whistles and I'm glad younger men seem to objectify women less than they did.