Disconnect the coax before each transmit, but that's a lot of trouble.
You can home brew a switch, assuming your transceiver has an amp interface (transceiver amplifier keying line). That same interface can be used to build a circuit that will switch the receive antenna to ground. There are also lots of these types of interfaces available commercially.
Doing a google search on "front end receiver protection" will return a lot of home brew and commercial solutions. Most of the home brew solutions are easy to build and use very few, inexpensive parts. If you prefer to buy a solution, DX Engineering sells this: http://www.dxengineering.com/parts/dxe-rg-5000 or this: http://www.dxengineering.com/parts/dxe-rg5000hd. It's an RF limiter that stays inline full time and limits the signal to a safe level. Looking at their website, I can't really tell the difference between the two units, other than $10 more for the "HD" one. Note that the website says the units cover 150KHz to 150MHz. Array Solutions also sells one: https://www.arraysolutions.com/Products/as_rxfep.htm (same frequency coverage).
My suggestion - home brew a switch. It's easy and inexpensive and there are lots of places to find plans / circuits.
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