Radome position on radar arch

Hi, just got an RD418HD and am wondering if i need a pedestal on my arch or not. I have it mounted at the moment, and just wondering if it is high enough in relation to a Glomex tv antenna, a standard VHF antenna, and a Ubiqity Bullet wifi antenna that ive mounted. Will those items cause interference on a height level? or just distance from the radome? or does it not matter if they are not going to be operated simultaneously? ie.....wont be using the wifi while underway, only at marina, where I then wont be using the radar?

Thanks