How to set the phase?

Hi! I'm doing a frequence response analysis and I have to set two antiphase forces. I'm using the card RLOAD1. I have created a load collector named Phase with no card image but I don't know how to set the phase. How can I set that one force has a phase of 0° while the  other has a phase of 180°? Could you help me? Thank you.

p.s. I have attached the structure of the card RLOAD1 <?xml version="1.0" encoding="UTF-8"?>