You can inject DC with RF and use a DC block on the ends. It should not cause any issues. That is how line powered amplifiers work. I actually use it to charge a battery and the DC does not affect the RF at all.
http://www.summitsource.com/channel-master-power-inserter-line-power-adder-75-ohm-f-connectors-with-dc-block-60-volt-2-amp-21450-mhz-part-8001ifd-p-7001.html
I'm using this to insert and siphon power off of RG-11 running 750'. Works great.
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