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Question: Is it possible to have the transmitter in the second floor, a the receivers exactly above and bellow in the third and first floors?
Document: This is the second unit I have purchased. The first was a single receiver this was a double receiver. I use a satellite receiver on the first floor to run two tv's on the second floor. Both units work well. The only issue is sometimes I have to slightly re-adjust the receivers position to receive the optimum picture. I'm not sure why it changes but that is the only issue I have.
When I first received these I was concerned about the "line-of-sight" that the product needed to transmit clear picture. After I hooked it up I was pleasantly surprised. I have one transmitter in the living room and a receiver in line with it. I also have a receiver 180 degrees the other direction. Both receivers pick up crystal clear picture and sound. Due to the frequency they transmit on I have far fewer interruptions.
First, if you have a slightly older TV that doesn't have the audio and video hookups needed, you can purcahse an RF Modulator (only about $9 on Amazon) to deal with this and it will work fine. Second, my cable box and TV did not seem to have audio and video hookups that were needed and not already being used so I had to go through the VCR. I am going to try to see if I can contact customer support to see if there is an alternative.
Well this makes the second set of these that I have bought within a couple of months and each time they disappointed me more. I bought the first one and managed to get the AV sender and reciever to work. However, the IR blaster did not work with the SD DVR box I have for Dish Network. I guess the remote function is either incompatible or just doesn't work at all (for both sets I purchased).
The office setup where the Nyrius was needed was complicated from the start. The transmitter was far away from the receivers and blocked with several walls and cubicles. I purchased an additional receiver for a total of three digital TVs. The Nyrius worked right out of the box with a very easy setup! Reception was very good at all three locations with very good quality video and audio signals. The remote control also worked from any of the locations. This product would be a five star if the price was a bit lower.
Also, nice to have them on 5.8GHz to avoid common interference. Haven't tested with dual receivers yet, but will post back once that happens.
Very simple to connect.It's small and easy to conceal.Worked perfect on the first try.The audio and visual on the TV are excellent.
It is working fine on the 5th channel but i prefert to fix the channel that will be used with a swithc instead of a buttom because when the energy fails  it return to the first channel, that has interference .
Was a little skeptical in purchasing this product but pulled the trigger. Received the item and plugged everything into my television set and low and behold...received a nice clear picture with audio on my portable 7 inch television. Next test was to test it in one of my back rooms thru several walls. Still clear picture, with the smallest break up (like a microwave interference but only for maybe a second.
The Nyrius GS3200 wireless A/V sender and two receivers were easy to set up and get working. In my particular situation  -a vintage mid-rise building with masonry walls, and a nearby elevator-- the audio had a loud hiss and random popping sounds that made it unusable. One receiver was ca. 18 ft, and the other ca 25ft from the sender unit, Signals had to go through walls in both cases.
Answer: Sure , the signal should be strong going each direction