If the two up-right bars are not damaged it is a simple pull the pin and replace the BATWING head.
You can also replace the BATWING with the JACK Antenna on the same two bars. You can see the two pins in this photos you remove and then just disconnect the RG cable. That is all that is involved to replace the antenna.
I am still using the BATWING antenna with the UHF ADD-ON dipoles with great results picking up the OTA National Broadcast digital TV stations from the local towns which is FREE TO THE PUBLIC to use.
Roy Ken