I'm trying to build a Radio wave penetration device that register the RSSI on the RX module. There are two 433 transceivers one is the RX and the other TX - I want to place between them different types of walls to measure the penetration of the radio wave.
To avoid other signals to interfere and to assure maximum penetration I want to use for the both a directional antenna. The catch is it must be as small as possible I've googled for hours trying to find small designs but no luck - I'm not going to transmit any data I just want a link and a RSSI read. any Ideas? I need it ( the antenna ) to fit a 12X12 cm box.