So i add between the antenna cable and the tv. do i need to plug this in to an outlet as well?

This booster does require power. It can be plugged into the wall, or into a USB port in the TV if you have one there.

I get great reception on my tv (full bars), but running it through my channel master dvr, i can't get signal on some. will this help?

It may if it the reason that you are not receiving the channel is that it needs a small amount of amplification. Look at the signal meter on the dvr. If it shows a small amount of signal then amplification may help to give enough signal strength for the dvr tuner to lock on the channel.

Can two antennas be boosted to one TV using a splitter?

I did this with a Splitter and it improved the reception because each Antenna was pointed in a different direction helping me get additional channels to one TV.

ASIN	B00BN5Z2UY
Antenna	Television
AntennaDescription	Television
Brand	Winegard
Brand Name	Winegard
Colour	White
Customer Reviews	3.8 out of 5 stars 1,513 Reviews
Global Trade Identification Number	00615798900045
Impedance	75 Ohms
Impedance Unit of Measure	75 Ohms
Item Type Name	Antenna Accessories
Item Weight Unit of Measure	0.2 Pounds
Manufacturer	WINEGARD
Number of Channels	1
UPC	809387603237 070090130253 807320295433 012301544305 647444447727 132018532362 807032951498 190283105070 809188507796 615798900045 080850164664 021113176932 163121481094 731215358951 803983024007 611101624110 012306027100 UPC 809387603237 070090130253 807320295433 012301544305 647444447727 132018532362 807032951498 190283105070 809188507796 615798900045 080850164664 021113176932 163121481094 731215358951 803983024007 611101624110 012306027100 See more
Warranty Description	1 year

Winegard LNA-100 Boost TV Antenna Amplifier, HDTV Signal Booster, HD Digital VHF UHF Amplifier, Indoor HDTV Ultra Low Noise Amp (USB Power Supply) - USA

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