Culture/Loyalty Question
I currently playing a HUGE map to get various achievments, I was wondering if there was anyway to increase your culture on the far flung planets. I've moved my cap planet to somewhere towards the middle of my empire but some places still only have loyalty of like 35%
Should I built broadcast towers along the very edge of my empire to help increase that planets loyalty or do these only effect enemy planets? If they help my own planets, do the effects stack?