Wireless video link example works with antenna only but not with SMA to SMA cable

I am trying to run wireless video link example https://decibel.ni.com/content/docs/DOC-22728 . It works fine if I use install antennas on my Tx and Rx USRPs. But it does not work if I use SMA to SMA cable to connect Tx and Rx USRPs. Can somebody guide me what is the reason why it is only workng with antennas but not with SMA to SMA cable. 
Thanks 
JK

I connect the 30 dB attenuator at RF input port of Rx USRP. But it does not work completely.
Without connecting attenuator i was not able to receive any thing on my Rx VI although it shows waveform. But after connecting attenuator receiver some times receive text messages and some times not. Also it does not work at all for images and for video it works partially but gives some error related to memory full after few mins.
I want to know why this example works completely without any problem if I use antennas, and why it does not work perfectly if i use sma to sma cable for connecting transmit and receive usrps.
Please guide
Thanks 
JK

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