Sorry for not getting back to you sooner, had some medical issues the last few days and was not able to get the model number and the "rest" of info, until today.
Model number is G402-885, the transmitter is a IF-100. Now the next thing is, I was corrected by my wife the engineer who "really" set the wireless fence up.
What she did was mount the transmitter about 18" inside our basement (at least I had that right!). Two inches behind where she mounted the transmitter, she built a second "wall" where she installed a piece of metal (cookie sheet thickness plus) about 36" wide. Behind the transmitter from the top of the basement down and under the bottom and to the front of the transmitter to "squelch" the signal to form the 180 degrees on the front side of our 5th wheel. I have to admit, she used her knowledge to re-design the system to make the 180 pattern, and here all the time I thought it was a flip of the switch.
Sorry about my "stupidity! I should have gotten ALL the info before I jumped in and replied to the thread, (guaranteed I will next time!). The old saying, "Once learned, twice burned!" LOL
So I really believe, and from what I've be told from the engineer of our project, you could use any unit and do the same to make it 180 degrees, but I am not going to guarantee anything. You might make contact with alien's from outer space, or have a drone crash into your unit! No telling....
Hope this helps and God bless,