What is it like to be a Signal Officer in the 75th Ranger Regiment?

You will need to have a solid grasp on SATCOM, ATAK/AVAS, and HF communications. HF has become extremely important in the Ranger Regiment due to the focus on the near peer threat and their jamming / direction finding capabilities. If you actually want to be a leader as opposed to just a BN assistant s6, and are interested in all things signal then I HIGHLY recommend you apply to the Regimental Special Troops Battalion to be assigned to the Regimental Communications Company. you would serve as a platoon leader and potentially as the company XO. The stuff they are doing, the kit they train with, and the problems they are solving are light years ahead of what the regular army is doing. It’s pretty fascinating stuff for even me as an infantryman.

(Join to see) Good for you. Being a SIGO sucks in any unit, but at least in the RR you will be cool.

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I can't speak to the 75th, but these are the attributes that helped me in my 31 years.
Be prepared to compete and be the best Signal and Infantry Officer. You want that Commander to be ready to send you for any task. You must think like your peers and know how they act and what their expectations are of the Signal support. Be prepared to take crap as the nerd of the Army, it is what we live with, but be their nerd - reliable, dependable, focused on mission execution. You must also understand your role as the Signal or Technical subject matter expert, this means knowing your team and equipments capability and when to say Sir / Ma'am I will get back to you on X to do it by Y and you make it happen quickly.
When you need to do your warfighter role, you need to be an excellent leader / infantry officer.
Expect that you will be learning and listening from your NCO's, peers and enlisted but you are the Officer in charge and that means having an expectation of performance and holding yourself and your people to the same standards.
God Speed in your pursuit, I hope you can get that dream job.