A support apparatus for a transportable telephone is disclosed. The apparatus includes a receptacle for securing a transportable telephone which includes a handset and signal processing instrumentation. A support member with a first end and a second end is also provided. The first end of the support member is attached to the receptacle. The second end of the support member is attached to a slide mount. The slide mount is slidably engageable with a stationary mount. The stationary mount is directly attached to the vehicle. The slide mount, support member, and stationary mount are electrically interconnected so that the transportable telephone may be coupled to an external antenna and an external power supply.