RF circuit prototyping on strip boards
If you really must use stripboard, then 450MHz is still just within the realms of a gridded ground. With a 60cm wavelength at 450MHz, connections of a few cms are still 'short'. Create a ground XY grid using every alternate strip, and short them all across on the topside by wires, at intervals of no more than every 1.5cms, preferrably less. Trim any active strips down to the exact length you need, do not leave strips excessively long. The impedance of a strip with both adjacent strips ground will be in the 100 ohms ballpark, don't expect any wonderful impedance matching to devices that expect to see 50 ohm interfaces. However at that frequency, you can get away with a lot.

You can get stripboard with a continuous ground on the other side, which is much more usable.

A common technique used in my lab for quick'n'dirty prototyping was to use a plain copper PCB as a ground plane, and glue little islands of PCB to them, each holding an IC, or a transmission line, with components strung between them or reaching down to ground. Works tolerably to a GHz or two, with care.

Ideally you'll get a PCB fabricated.