You could start a ministry sending spam ...
There is a challenge to what you are suggesting. GloryStar is providing affordable start up FTA systems for people wanting to receive Christian signals FTA. Part of their program is providing "filtered" FTA. The programs programmed into a GloryStar receiver should be acceptable to a Christian audience and not contrary to the goals of the ministries.
At it's base level FTA can pick up anything ... if you (for examples) hand out free radios in a particular town to pick up the local Christian broadcaster what is to stop people from tuning them in to the local Howard Stern wannabe? You could hand out fixed tuned radios (as is done in Haiti and elsewhere around the world. Basically that is what GloryStar is doing - although they still charge for their systems.
So now all you need is a financial source to support funding the discounted or free distribution of GloryStar systems. Although with those systems people are not locked into your signal. A fixed tuned satellite system that would only be able to pick up YOUR broadcast would probably be cost prohibitive.
You are on a decent platform ... the zero response is likely (and it is hard to put it any nicer) an indication as to how accepted your programming is. If people are not interested enough to even complain about your broadcasts you might want to take a serious listen and look at why people should bother with listening.
Don't answer the question here ... we don't need to know the answer. But find the answer to the question of WHY anyone would bother to listen to your programming.
It has been suggested that you play (if video) public domain TV shows and then insert your message. That is a "scheme" used by many family oriented radio stations and networks as well. Sound like a secular station then hook people with the meat of your message when they are unaware. Get them to open the spam.
Look at (and listen to) what works for other ministries then sit down and ask yourself why anyone would bother to listen to YOUR ministry. What makes YOU special? And how can you make yourself special enough to get people to listen.
Seek out a board or list that discusses Christian radio ... get involved in that community. And best wishes on getting your feed to be successful.