The phrase "multiple receivers" means that there are more than one person or device that receives or gets something, like a message or signal. Full definition
Now, you really want to look at something with multiple receivers, so that you are free to move around the house. (10exposed.com)
There are multiple receivers on the field at one time. (sbnation.com)
Nowadays the cost of covering a broad area of the ocean with multiple receivers to locate marine mammals or underwater vehicles based on the acoustic signals they produce is excessively high. (sciencedaily.com)