this range is not so good , but it depend inside of which kind of bilding u will use it for example for 2.4GHZ wave long as = 12.5 sm that mean if between details of metallic scelet of bilding have more them 13 sm u can use it , if not try use more longer wave like 27-150 MHZ or maybe 433 . for 433 i tested Aurel TX RX analog radio modules inside of bilding i have about 30 metr distance . hope it answer ...