No, plus you risk damaging the other devices connected to the Electroline drop amp.
Use a separate antenna for your UHF PRS radio and ensure there is some distance between it and your RX antenna connected to the Electroline drop amp. Basically, if you mount the antenna’s on opposite sides of a home you’ll be fine. The UHF PRS radio will still interfere with the RX radios when you TX, but it will not damage them.
If your current multi-band antenna is a discone, you probably could TX through it using the UHF PRS as long as it is the “only“ device connected to the coaxial cable directly to the antenna. A dedicated antenna tuned for the PRS frequencies is preferred.
