Most locations in Vegas will have good reception. It's mostly LOS there and with almost all of the stations on Black Mtn., even the LPTV stations should be pretty easy to receive. They should even have a NextGen station by Memorial Day if all goes according to plan. If you look up the stations' broadcast contours on RabbitEars, you'll see strong signals citywide.
If you check out the blog page on RabbitEars, my Arizona TV Station Update also includes news on Vegas stations, since most of them broadcast into Arizona. If you check other forums, Las Vegas has a knowledgeable and enthusiastic OTA community, one of whom serves as my source for news there, since I can't get there as often as I used to.